Misplaced Pages

Dobson ozone spectrophotometer

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.

The Dobson spectrophotometer , also known as Dobsonmeter , Dobson spectrometer , or just Dobson is one of the earliest instruments used to measure atmospheric ozone .

#589410

66-462: The Dobson spectrometer was invented in 1924 by British physicist and meteorologist Gordon Dobson . A history of the development of the instrument is here and an example of one of Dobson's own instruments remains on display in the University of Oxford Department of Physics. Dobson spectrophotometers can be used to measure both total column ozone and profiles of ozone in the atmosphere . Ozone

132-543: A GBE (in recognition of his role as chairman of the Scottish War Savings Committee) and the award of medal of the order to Lizzie Robinson, a munitions worker. The order had been established primarily as a civilian award; in August 1918, however, not long after its foundation, a number of awards were made to serving naval and military personnel. Four months later, a 'Military Division' was added to

198-404: A broad riband or sash, passing from the right shoulder to the left hip. Knights Commander and male Commanders wear the badge from a ribbon around the neck; male Officers and Members wear the badge from a ribbon on the left chest; female recipients other than Dames Grand Cross (unless in military uniform) normally wear it from a bow on the left shoulder. An oval eight-pointed star is worn, pinned to

264-553: A burning building containing explosives. In December 1922 the statutes of the order were amended; there having been a large number of awards for war work prior to this date, these amended statutes placed the order on more of a peacetime footing. For the first time numbers of appointments were limited, with the stipulation that senior awards in the Civil Division were to outnumber those in the Military Division by

330-453: A circlet bearing the motto of the Order; the reverse bears George V's Royal and Imperial Cypher. (Prior to 1937 Britannia was shown within the circlet.) The size of the badges varies according to rank: the higher classes have slightly larger badges. The badges of Knights and Dames Grand Cross, Knights and Dames Commander, and Commanders are enamelled, with pale blue crosses, crimson circlets and

396-466: A citizen of a Commonwealth realm can convert their appointment from honorary to substantive, and they then enjoy all privileges of membership of the order, including use of the title of Sir and Dame for the senior two ranks of the Order. (An example of the latter is Irish broadcaster Terry Wogan , who was appointed an honorary Knight Commander of the Order in 2005, and on successful application for British citizenship, held alongside his Irish citizenship,

462-443: A gold central medallion. Officers' badges are plain silver-gilt, while those of Members are plain silver. From 1917 until 1937, the badge of the order was suspended on a purple ribbon, with a red central stripe being added for the military division in 1918. Since 1937, the ribbon has been rose-pink with pearl-grey edges (with the addition of a pearl-grey central stripe for the military division). Knights and Dames Grand Cross wear it on

528-424: A position he held until 1950, when he became university demonstrator in physics and climatology. He was a fellow of Merton College, Oxford , from 1937 to 1956. By studying meteorites he noticed that the temperature profile of the tropopause was not constant, as had previously been believed (hence the name stratosphere ). In fact there was, he showed, a region where the temperature sharply rose. This, he proposed,

594-492: A proportion of six to one. Furthermore appointments in the civil division were to be divided equally between UK and overseas awards. With regard to the Medal of the Order (but not the order itself), a distinction was made in 1922 between awards 'for gallantry' and awards 'for meritorious service' (each being appropriately inscribed, and the former having laurel leaves decorating the clasp, the latter oak leaves). In 1933 holders of

660-423: A small area in the direction of the sun. Today this method is often used to calibrate data obtained by other methods, including satellites. Some modernized versions of Dobson spectrophotometer exist and continue to provide data. About 120 Dobsonmeters have been made, mostly by R&J Beck of London, of which about 50 remain in use today. The most famous ones are probably Nos. 31 and 51 with which Joe Farman of

726-651: Is a semi-eponymous model of atmospheric currents that explains the distribution of ozone by latitude. Dobson was elected a Fellow of the Royal Society (FRS) in 1927 , awarded their Rumford Medal in 1942 and delivered their Bakerian lecture in 1945. He won the Chree medal and prize in 1949. He served as president of the Royal Meteorological Society from 1947 to 1949 and was awarded their prestigious Symons Gold Medal for 1938. He

SECTION 10

#1732772399590

792-516: Is an image of Britannia surrounded by the motto, with the words "For Meritorious Service" at the bottom; on the reverse is George V's Imperial and Royal Cypher, with the words "Instituted by King George V" at the bottom. The name of the recipient is engraved on the rim. This medal is nicknamed "the Gong", and comes in both full-sized and miniature versions – the latter for formal white-tie and semi-formal black-tie occasions. A lapel pin for everyday wear

858-973: Is not a member of the College of Arms , as are many other heraldic officers; and the Lady Usher of the Purple Rod does not – unlike the Order of the Garter equivalent, the Lady Usher of the Black Rod – perform any duties related to the House of Lords . Since the Second World War, several Commonwealth realms have established their own national system of honours and awards and have created their own unique orders, decorations and medals. A number, though, continue to make recommendations for appointments to

924-517: Is tri-atomic oxygen, O 3 ; ozone molecules absorb harmful UV light in the atmosphere before it reaches the surface of the earth. No UVC radiation penetrates to the ground as it is absorbed in the ozone-oxygen cycle . However some longer-wave and less harmful UVB and most of the UVA are not absorbed as ozone is less opaque to these frequencies, so they penetrate to the ground level of Earth in higher quantities. The sources of light used may vary. Beside

990-883: The British Antarctic Survey discovered the Ozone Hole above the South Pole in 1984. The "World Standard Dobson", No. 83, is owned and operated by the US Dept of Commerce's, NOAA, as is the secondary standard, No. 65. The oldest instrument still in use is No.8 located at the roof of the Norwegian Polar Institute at Ny-Ålesund , Svalbard . This instrument has the last reported data for 1997. The instrument D003, operated in Kunming, China reported data to August 2009. The history of

1056-559: The Order of Canada . On the other hand, the Australian Honours System unilaterally created in 1975 did not achieve bi-partisan support until 1992, which was when Australian federal and state governments agreed to cease Australian recommendations for British honours; the last Australian recommended Order of the British Empire appointments were in the 1989 Queen's Birthday Honours . New Zealand continued to use

1122-473: The 21st century quotas were introduced to ensure consistent representation among recipients across nine categories of eligibility: with the largest proportion of awards being reserved for community, voluntary and local service. Non-military awards of the British Empire Medal resumed in 2012, starting with 293 BEMs awarded for Queen Elizabeth II's Diamond Jubilee . In 2017 the centenary of

1188-792: The British Empire . Rather than using this chapel, the Order now holds its great services upstairs in the nave of the cathedral. In addition to the Chapel of the Order of the British Empire, St Paul's Cathedral also houses the Chapel of the Order of St Michael and St George . Religious services for the whole Order are held every four years; new Knights and Dames Grand Cross are installed at these services. Knights Grand Cross and Knights Commander prefix Sir , and Dames Grand Cross and Dames Commander prefix Dame , to their forenames. Wives of Knights may prefix Lady to their surnames, but no equivalent privilege exists for husbands of Knights or spouses of Dames. Such forms are not used by peers and princes, except when

1254-494: The British Empire for Gallantry. Any individual made a member of the order for gallantry after 14 January 1958 wears an emblem of two crossed silver oak leaves on the same ribbon as the badge, with a miniature version on the ribbon bar when worn alone. When the ribbon only is worn the emblem is worn in miniature. It could not be awarded posthumously , and was replaced in 1974 with the Queen's Gallantry Medal (QGM). If recipients of

1320-824: The Military Division of the order from the UK and across the Empire. Recommendations for all appointments to the Order of the British Empire were originally made on the nomination of the King's United Kingdom ministers (recommendations for overseas awards were made by the Foreign Office , the Colonial Office , the India Office and the Dominions Office ); but in the early 1940s the system was changed to enable

1386-436: The Order of the British Empire for Gallantry received promotion within the order, whether for gallantry or otherwise, they continued to wear also the insignia of the lower grade with the oak leaves; however, they used only the post-nominal letters of the higher grade. When the order was founded in 1917, badges, ribands and stars were appointed for wear by recipients. In 1929 mantles, hats and collars were added for recipients of

SECTION 20

#1732772399590

1452-520: The Order of the British Empire. In 2024 appointments to the order were made by the governments of: Most members of the order are citizens of the United Kingdom or Commonwealth realms that use the UK system of honours and awards. In addition, honorary awards may be made to citizens of nations where the monarch is not head of state ; these permit use of post-nominal letters, but not the title of Sir or Dame . Honorary appointees who later become

1518-404: The Order, however, are not assigned any special precedence. As a general rule, only wives and children of male recipients are afforded privileges. Knights and Dames Grand Cross are also entitled to be granted heraldic supporters . They may, furthermore, encircle their arms with a depiction of the circlet (a circle bearing the motto) and the collar; the former is shown either outside or on top of

1584-463: The United Kingdom; those who would formerly have met the criteria for the medal were instead made eligible for the MBE. In 2004, a report entitled A Matter of Honour: Reforming Our Honours System by a Commons select committee recommended phasing out the Order of the British Empire, as its title was "now considered to be unacceptable, being thought to embody values that are no longer shared by many of

1650-450: The addition of a vertical pearl grey stripe in the centre for awards in the military division). From time to time the order was expanded: there was an increase in the maximum permitted number of recipients in 1933, and a further increase in 1937. During the Second World War, as had been the case during and after World War I, the number of military awards was greatly increased; between 1939 and 1946 there were more than 33,000 appointments to

1716-584: The amount of ozone. When turned, the R-dial filters and blocks out the light of the UVA wavelength until the intensity of the two wavelengths of light are equal. The ratio of the two wavelengths at incidence can be calculated once the filtered intensities are the same. The results are measured in Dobson Units , equal to 10 μm thickness of ozone compressed to Standard conditions for temperature and pressure (STP) in

1782-474: The cathedral. That year, Commonwealth awards made up 40% of all OBEs and MBEs awarded (and 35% of all living recipients of the higher awards). Gradually that proportion reduced as independent states within the Commonwealth established their own systems of honours . The last Canadian recommendation for the Order of the British Empire was an MBE for gallantry gazetted in 1966, a year before the creation of

1848-418: The circlet. In 1929, to bring the order into line with the other orders of chivalry, members of the first class of the order (GBE) were provided with mantles, hats and collars. Only Knights/Dames Grand Cross wear these elaborate vestments; the hat is now rarely, if ever, worn. Use of the mantle is limited to important occasions (such as quadrennial services and coronations ). The mantle is always worn with

1914-444: The collar. Although the mantle was introduced in 1929, very few mantles would have been produced prior to the 1937 design changes, as there were few occasions for wearing them in the intervening years. On certain days designated by the sovereign, known as " collar days ", members attending formal events may wear the order's collar over their military uniform, formal day dress, evening wear or robes of office. Collars are returned upon

1980-524: The column. If all of the ozone in the atmospheric column one was measuring were compressed to STP, the thickness of the compressed atmosphere in mm would equal an answer in Dobson Units divided by 100. The vertical distribution of ozone is derived using the Umkehr method . This method relies on the intensities of reflected, rather than direct, UV light . Ozone distribution is derived from the change in

2046-479: The country's population". The committee further suggested changing the name of the award to the Order of British Excellence, and changing the rank of Commander to Companion (as the former was said to have a "militaristic ring"), as well as advocating for the abolition of knighthoods and damehoods; the government, however, was not of the opinion that a case for change had been made, and the aforementioned suggestions and recommendations were not, therefore, pursued. In

Dobson ozone spectrophotometer - Misplaced Pages Continue

2112-403: The death of their owners, but other insignia may be retained. The six office-holders of the order wear pearl-grey mantles lined with rose-pink, having on the right side a purple shield charged with the roundel from the badge. Each of these office-holders wears a unique badge of office, suspended from a gold chain worn around the neck. The British Empire Medal is made of silver. On the obverse

2178-500: The direct sun light, the light from the clear sky, moon or stars may be used. The Dobson spectrometer measures the total ozone by measuring the relative intensity of the UVB radiation that reaches the Earth and comparing it to that of UVA radiation at ground level. If all of the ozone were removed from the atmosphere, the amount of UVB radiation would equal the amount of UVA radiation on

2244-626: The distinction between ranks in military operational gallantry awards will cease'. The reforms affected the order at various levels: for example the automatic award each year of a GBE to the Lord Mayor of London ceased; the OBE replaced the Imperial Service Order as an award for civil servants and the number of MBEs awarded each year was significantly increased. As part of these reforms the British Empire Medal stopped being awarded by

2310-529: The former was to be responsible for recording all proceedings connected with the order, issuing warrants under the seal of the order and making arrangements for investitures, while the latter (at that time the Permanent Secretary to the Treasury ) was responsible for collecting and tabulating the names of those who were to receive an award. The office of Dean was added in 1957. The King of Arms

2376-401: The governments of overseas dominions to make their own nominations; Canada and South Africa began doing so in 1942, followed by Australia, New Zealand and other Commonwealth realms. In May 1957, forty years after the foundation of the order, it was announced that St Paul's Cathedral was to serve as the church of the order, and in 1960 a chapel was dedicated for its use within the crypt of

2442-571: The ground. As ozone does exist in the atmosphere, the Dobson Spectrometer can use the ratio between UVA and UVB radiation on the ground to determine how much ozone is present in the upper atmosphere to absorb the UVC radiation. The ratio is determined by turning the R-dial, which can be rotated a full 300°, on the instrument. The spectrometer compares two different wavelength intensities, UVB (305 nm) and UVA (325 nm), in order to calculate

2508-450: The highest class of the order (GBE). The designs of all these items underwent major changes in 1937. The badge is worn by all members of the order; the size, colour and design depends on the class of award. The badge for all classes is in the form of a cross patonce (having the arms growing broader and floriated toward the end) with a medallion in the centre, the obverse of which bears a crowned image of George V and Queen Mary within

2574-446: The insignia to Buckingham Palace and by ceasing to make reference to their honour, but they still hold the honour unless and until annulled by the monarch. In 2003, The Sunday Times published a list of the people who had rejected the Order of the British Empire, including David Bowie , John Cleese , Nigella Lawson , Elgar Howarth , L. S. Lowry , George Melly , and J. G. Ballard . In addition, Ballard voiced his opposition to

2640-640: The junior post-nominal letters. The British sovereign is the sovereign of the order and appoints all other officers of the order (by convention, on the advice of the governments of the United Kingdom and some Commonwealth realms ). The second-most senior officer is the Grand Master (a 'Prince of the Blood Royal, or other exalted personage' appointed by the sovereign, who, by virtue of their appointment, becomes 'the First or Principal Knight Grand Cross of

2706-528: The latter. Knights and Dames Commander and Commanders may display the circlet, but not the collar, surrounding their arms. The badge is depicted suspended from the collar or circlet. See List of current honorary knights and dames of the Order of the British Empire Only the monarch can annul an honour. The Honours Forfeiture Committee considers cases and makes recommendations for forfeiture. An individual can renounce their honour by returning

Dobson ozone spectrophotometer - Misplaced Pages Continue

2772-463: The left breast, by Knights and Dames Grand Cross; Knights and Dames Commander wear a smaller star composed of 'four equal points and four lesser'. The star is not worn by the more junior classes. Prior to 1937 each star had in the centre a gold medallion with a figure of Britannia, surrounded by a crimson circlet inscribed with the motto of the order ('For God and the Empire'); since 1937 the effigies of King George V and Queen Mary have been shown within

2838-588: The medal 'for gallantry', which had come to be known as the Empire Gallantry Medal , were given permission to use the postnominal letters EGM (and at the same time to add a laurel branch emblem to the ribbon of the medal); however, in 1940, awards of the EGM ceased and all holders of the medal were instructed to exchange it for a new and more prestigious gallantry award: the George Cross . In 1941,

2904-559: The medal of the order 'for meritorious service' was renamed the British Empire Medal , and the following year its recipients were granted the right to use the postnominal letters BEM. During the war, the BEM came to be used to recognise acts of bravery which did not merit the award of a George Cross or George Medal , a use which continued until the introduction of the Queen's Gallantry Medal in 1974. The designs of insignia of

2970-449: The medal. The colour of the riband was also changed: twenty years earlier, prior to the order's establishment, Queen Mary had made it known that pink would be her preferred colour for the riband of the proposed new order, but, in the event, purple was chosen. Following her appointment as Grand Master of the order in 1936 a change was duly made and since 9 March 1937 the riband of the order has been 'rose pink edged with pearl grey’ (with

3036-473: The names of the former are written out in their fullest forms. Male clergy of the Church of England or the Church of Scotland do not use the title Sir (unless they were knighted before being ordained) as they do not receive the accolade (they are not dubbed "knight" with a sword), although they do append the post-nominal letters ; dames do not receive the accolade, and therefore female clergy are free to use

3102-454: The numbers restricted to the order as full members do. Although the Order of the British Empire has by far the highest number of members of the British orders of chivalry, with more than 100,000 living members worldwide, there are fewer appointments to knighthoods than in other orders. From time to time, individuals may be promoted to a higher grade within the Order, thereby ceasing usage of

3168-620: The order alongside its own honours until the establishment of the New Zealand Order of Merit in 1996. Other Commonwealth realms have continued to use the Order of the British Empire alongside their own honours. In 1993 the Prime Minister, John Major , instituted a reform of the honours system with the aim 'that exceptional service or achievement will be more widely recognised; that greater importance will be given to voluntary service; that automatic honours will end; that

3234-408: The order and medal were altered in 1937, prior to the coronation of King George VI , 'in commemoration of the reign of King George V and Queen Mary, during which the Order was founded'. The figure of Britannia at the centre of the badge of the order was replaced with an image of the crowned heads of the late King and Queen Mary, and the words 'Instituted by King George V' were added to the reverse of

3300-409: The order was celebrated with a service at St Paul's Cathedral. The order is limited to 300 Knights and Dames Grand Cross, 845 Knights and Dames Commander, and 8,960 Commanders. There are no limits applied to the total number of members of the fourth and fifth classes, but no more than 858 officers and 1,464 members may be appointed per year. Foreign appointees, as honorary members, do not contribute to

3366-426: The order, to which serving personnel would in future be appointed. The classes were the same as for the Civil Division (as it was now termed), but military awards were distinguished by the addition of a central vertical red stripe to the purple riband of the civil awards. In 1920 appointment as an MBE 'for an act of gallantry' was granted for the first time, to Sydney Frank Blanck Esq, who had rescued an injured man from

SECTION 50

#1732772399590

3432-433: The ratio of the same UV-pair frequencies with time as the sun sets. An "Umkehr" measurement takes about three hours, and provides data up to an altitude of 48 km, with the most accurate information for altitudes above 30 km. The Dobson method has its drawbacks. It is strongly affected by aerosols and pollutants in the atmosphere, because they also absorb some of the light at the same wavelength. Measurements are made over

3498-412: The recipient either a knight if male or a dame if female. There is also the related British Empire Medal , whose recipients are affiliated with, but not members of, the order. The order was established on 4 June 1917 by King George V , who created the order to recognise 'such persons, male or female, as may have rendered or shall hereafter render important services to Our Empire'. Equal recognition

3564-603: The same Order'). The position of Grand Master has been held by the following people: In addition to the sovereign and the grand master , the order has six further officers: At its foundation the order was served by three officers: the King of Arms, the Registrar & Secretary and the Gentleman Usher of the Purple Rod. In 1922 the Prelate was added, and the office of Registrar was separated from that of Secretary:

3630-461: The standard of the George Medal (even though, as appointments to an order of chivalry, they were listed before it on the Order of Wear . In contrast to awards for meritorious service, which usually appear without a citation, there were often citations for gallantry awards, some detailed and graphic. From 14 January 1958, these awards were designated Commander, Officer or Member of the Order of

3696-525: The stations and instruments can be found at the World Ozone and UV Data Centre. The Environment Canada ( Alan West Brewer ) developed double- and single- monochromator spectrophotometers known as the "Brewer" Spectrophotometer produced by Kipp & Zonen. Gordon Dobson Gordon Miller Bourne Dobson CBE FRS (25 February 1889 – 10 March 1976) was a British physicist and meteorologist who did important work on ozone . He

3762-506: The title Dame . Knights and Dames Grand Cross use the post-nominal GBE; Knights Commander, KBE; Dames Commander, DBE; Commanders, CBE; Officers, OBE; and Members, MBE. The post-nominal for the British Empire Medal is BEM. Members of all classes of the order are assigned positions in the order of precedence . Wives of male members of all classes also feature on the order of precedence, as do sons, daughters and daughters-in-law of Knights Grand Cross and Knights Commander; relatives of Ladies of

3828-589: The titles Sir for men and Dame for women before their forenames, except with honorary awards. King George V founded the order to fill gaps in the British honours system : In particular, George V wished to create an order to honour the many thousands of individuals from across the Empire who had served in a variety of non-combat roles during the First World War . From its foundation the order consisted of five classes (GBE, KBE/DBE, CBE, OBE and MBE) and

3894-665: Was educated at Sedbergh School and Gonville and Caius College, Cambridge , graduating with a first in Natural Sciences in 1909. He was later awarded DSc (Oxon). In 1913 he became an instructor in meteorology at the Central Flying School , and was at the Royal Aircraft Establishment , Farnborough, from 1916 to 1918. In 1921 he was appointed lecturer in meteorology at the University of Oxford, becoming reader in meteorology in 1927,

3960-402: Was first announced at the end of December 2006, and is available to recipients of all levels of the order, as well as to holders of the British Empire Medal . The pin design is not unique to any level. The pin features the badge of the order, enclosed in a circle of ribbon of its colours of pink and grey. Lapel pins must be purchased separately by a member of the order. The creation of such a pin

4026-444: Was happening because UV radiation was heating ozone in what has become known as the ozone layer . He noted the connection between sunspots and weather, and measured the ultraviolet levels of our star. He built the first Dobson ozone spectrophotometers and studied the results over many years. The Dobson unit , a unit of measurement of vertically integrated atmospheric ozone density, is named after him. The Brewer-Dobson circulation

SECTION 60

#1732772399590

4092-506: Was made a CBE in 1951. Order of the British Empire The Most Excellent Order of the British Empire is a British order of chivalry , rewarding contributions to the arts and sciences, work with charitable and welfare organisations, and public service outside the civil service . It comprises five classes of awards across both civil and military divisions, the most senior two of which make

4158-469: Was made a substantive member and subsequently styled as Sir Terry Wogan). Although initially intended to recognise meritorious service, the order began to also be awarded for gallantry. There were an increased number of cases in the Second World War for service personnel and civilians including the merchant navy, police, emergency services and civil defence, mostly MBEs but with a small number of OBEs and CBEs. Such awards were for gallantry that did not reach

4224-513: Was open to both women and men; provision was also made for conferring honorary awards on foreign recipients. At the same time, alongside the order, the Medal of the Order of the British Empire was instituted, to serve as a lower award granting recipients affiliation but not membership. The first investiture took place at Ibrox Stadium , as part of a royal visit to the Glasgow shipyards, with the appointment of Alexander Ure, 1st Baron Strathclyde as

4290-585: Was recommended in Sir Hayden Phillips ' review of the honours system in 2004. The Chapel of the Order of the British Empire is in St Paul's Cathedral . It occupies the far eastern end of the cathedral crypt and was dedicated in 1960. The only heraldic banners normally on display in the chapel are those of the Sovereign of the Order of the British Empire and of the Grand Master of the Order of

4356-526: Was to be given for services rendered in the UK and overseas. Today the majority of recipients are UK citizens, though a number of Commonwealth realms outside the UK continue to make appointments to the order. Honorary awards may be made to citizens of other nations of which the order's sovereign is not the head of state. The five classes of appointment to the Order are, from highest grade to lowest grade: The senior two ranks of Knight or Dame Grand Cross and Knight or Dame Commander entitle their members to use

#589410