COBRA References
Source: environment.data.gov.uk (2018-06-19)

COBRA (impact of COmbined iodine and Bromine Release on the Arctic atmosphere): Air-Surface Interactions Properties measurements from Airborne, Ground-based and Laboratory instrumentation. COBRA (impact of COmbined iodine and Bromine Release on the Arctic atmosphere) is a UK IPY (International Polar Year) consortium that aims to investigate the release mechanisms of iodine in the Arctic and the potential combined effects of iodine and bromine on its atmosphere. The team measured reactive inorganic halogens (BrO, IO, OIO, I2), O3, Hg, HOx, HCHO, NOx, VOCs and reactive halocarbons from temporary laboratories located on the eastern shore of Hudson Bay, north of Kuujjuarapik, during February-March 2008. Met balloons and O3 sondes were launched daily. COBRA set up an ice camp and flux chamber experiments ~500 m into the bay to directly measure halogen emissions and ozone deposition, and measured physical, chemical and biological characteristics of the sea-ice (and potentially of frost flowers) at different depths. The project is linked with OOTI, which carried out a simultaneous field experiment at Kuujjuarapik.

COBRA - References
- Ariya, P.A.; Khalizov, A.; Gidas, A. Reactions of gaseous mercury with atomic and molecular halogens: kinetics, product studies, and atmospheric implications. J. Phys. Chem. A., 106, 7310-7320, 2002.
- Ball SM, Langridge JM, Jones RL, Broadband cavity enhanced absorption spectroscopy using light emitting diodes, Chem Phys Lett, 398 (1-3): 68-74, 2004
- Belzile C, Johannessen SC, Gosselin M, et al., Ultraviolet attenuation by dissolved and particulate constituents of first-year ice during late spring in an Arctic polynya, Limnol. Oceanogr., 45 (6): 1265-1273, 2000
- Bottenheim JW, Gallant AG, Brice KA, Measurements of NOy Species and O3 At 82oN Latitude, Geophys Res Lett, 13 (2): 113-116, 1986
- Bottenheim JW, Fuentes JD, Tarasick DW, et al., Ozone in the Arctic lower troposphere during winter and spring 2000 (ALERT2000), Atmos. Environ. 36 (15-16): 2535-2544, 2002
- Calvert, J.G.; Lindberg, S. E. Potential influence of iodine-containing compounds on the chemistry of the troposphere in the polar spring. I. Ozone depletion. Atmos. Environ. 38, 5087-5104, 2004a.
- Calvert, J.G.; Lindberg, S. E. The potential influence of iodine-containing compounds on the chemistry of the troposphere in the polar spring. II. Mercury depletion. Atmos. Environ. 38, 5105-5116. 2004b.
- Carpenter, L.J., J. R. Hopkins, C. E. Jones, et al., Abiotic source of CH2I2 and other reactive organic halogens in the sub-Arctic atmosphere?, submitted to Environ. Sci. Tech., 2005.
- Gauchard et al, Characterizing Mercury Depletion Events recorded during an international study of mercury in Ny-Alesund, Svalbard, spring 2003., submitted to Atmos Environ
- Hollwedel J, Wenig M, Beirle S, Kraus S, Kuhl S, Wilms-Grabe W, Platt U, Wagner T, Year-to-year variations of spring time polar tropospheric BrO as seen by GOME, Adv. .Space Res. , 34 (4): 804-808 Sp. Iss. 2004 2004
- Hutterli, M.A., A.M. Rankin, A.E. Jones, K.J. Knox, and E.W. Wolff, A laboratory study of ozone depletion over frost flowers, in Geophysical Research Abstracts, pp. 06593, SRef-ID: 1607-7962/gra/EGU05-A-06593, Vienna, 2005.
- Evans, M.J., D.J. Jacob, E. Atlas, et al., Coupled evolution of BrOx-ClOx-HOx-NOx chemistry during bromine-catalyzed ozone depletion events in the Arctic boundary layer, J. Geophys. Res., 108 (D4), 2003.
- Fiedler, S. E., A. Hese, A. A. Ruth, Incoherent broad-band cavity-enhanced absorption spectroscopy, Chem. Phys. Lett. 371, 284-294, 2003.
- Goodsite ME, Plane JMC, Skov H, A theoretical study of the oxidation of Hg-0 to HgBr2 in the troposphere, Environ. Sci. Tech, 38 (6): 1772-1776, 2004
- Kaleschke, L., et al., Frost flowers on sea ice as a source of sea salt and their influence on tropospheric halogen chemistry, Geophys. Res. Lett. , Vol. 31, L16114, doi:10.1029/2004GL020655, 2004
- Kaleschke, L., Boundary-layer ozone loss near the poles - why spring and not autumn?, EGU General Assembly, Vienna, Austria, 24-29 April 2005
- Kern, S., L. Kaleschke and D.A. Clausi. A Comparison of two 85 GHz SSM/I Ice Concentration Algorithms with AVHRR and ERS-SAR, IEEE Trans. Geosci. Rem. Sens., 41(10), 2294-- 2306, 2003
- Legagneux, L., A. Cabanes, and F. Domine, Measurement of the specific surface area of 176 snow samples using methane adsorption at 77K, Journal of Geophysical Research, 107 (D17), 4335, doi:10.1029/2001JD001016, 2002
- Lehrer, E., Honninger, G. and Platt, U., The mechanism of halogen liberation in the polar troposphere, Atmos. Chem. Phys. Disc.,4, 28-6- 2004.
- Lindberg SE, Brooks S, Lin CJ, et al., Dynamic oxidation of gaseous mercury in the Arctic troposphere at polar sunrise, Environ. Sci. Tech., 36 (6): 1245-1256, 2002.
- Martin, S., Y. Yu, and R. Drucker, The temperature dependence of frost flower growth on laboratory sea ice and the effect of the flowers on infrared observations of the surface, J. Geophys. Res., 101 (C5), 12,111-12,125, 1996.
- McFiggans, G., J.M.C. Plane, B.J. Allan, L.J. Carpenter, H. Coe, and C. O'Dowd, A modeling study of iodine chemistry in the marine boundary layer. J. Geophys. Res., 105, 14371, 2000.
- McFiggans G, Cox RA, Mossinger JC, et al., Active chlorine release from marine aerosols: Roles for reactive iodine and nitrogen species, J. Geophys. Res., 107 (D15): art. no. 4271, 2002
- Oum, K.W., M.J. Lakin, and B.J. Finlayson-Pitts, Bromine activation in the troposphere by the dark reaction of O3 with sea water ice, Geophys. Res. Lett., 25 (21), 3923-3926, 1998.
- Rankin, A.M., Aspects of Aerosol Chemistry in Coastal Antarctica, Ph.D. thesis, University of Cambridge/British Antarctic Survey, Cambridge, U.K., 2004.
- Roscoe, HK, Kreher K, Friess U, Ozone loss episodes in the free Antarctic troposphere, suggesting a possible climate feedback, Geophys. Res. Lett., 28 (15): 2911-2914, 2001
- Schroeder, W. H.; Anlauf, K. G; Barrie, L. A; Lu, J. Y; Steffen, A.; Schneeberger, D. R; Berg, T. Arctic springtime depletion of mercury. Nature, 1998, 394, 331-332.
- Skov H, Christensen JH, Goodsite ME, et al., Fate of elemental mercury in the arctic during atmospheric mercury depletion episodes and the load of atmospheric mercury to the arctic, Environ. Sci. Tech., 38 (8): 2373-2382, 2004.
- Spicer CW, Plastridge RA, Foster KL, et al., Molecular halogens before and during ozone depletion events in the Arctic at polar sunrise: concentrations and sources, Atmos. Environ., 36 (15-16): 2721-2731, 2002
- Spreen G., Kaleschke L., Heygster G., 2005, Operational Sea Ice Remote Sensing with AMSR-E 89 Ghz Channels, Proc. of Int. Geoscience and Remote Sensing Symposium IGARSS, 25-29 July 2005, Seoul, Korea.
- Sturges, W. T., Cota, G. F., Buckley, P. T. Vertical profiles of bromoform in snow, sea ice, and seawater in the Canadian Arctic, J. Geophys. Res. 102, xx-xxxx-xxxx, 1997.
- Sumner, A. L.; Shepson, P. B. Snowpack production of formaldehyde and its effect on the Arctic troposphere. Nature., 398, 230-233, 1999.
- Tarasick, DW, Bottenheim JW, Surface ozone depletion episodes in the Arctic and Antarctic from historical ozonesonde records, Atmos Chem Phys, 2: 197-205, 2002
- Yang, X. R. A. Cox, N. J. Warwick, J. A. Pyle, G. D. Carver, F. M. O'Connor and N.H. Savage, Tropospheric bromine chemistry and its impacts on ozone, in review, submitted to JGR
- Yu Y, Maykut GA, Rothrock DA, Changes in the thickness distribution of Arctic sea ice between 1958-1970 and 1993-1997, J. Geophys. Res, 109 (C8): art. no. C08004, 2004
- Zingler J, Platt U, Iodine oxide in the Dead Sea Valley: Evidence for inorganic sources of boundary layer IO, J. Geophys. Res. 110 (D7): art. no. D07307, 2005