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  • American Geophysical Union (AGU)
  • 2005-2009  (2)
  • 2008  (2)
  • 1
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    DMS air/sea flux and gas transfer coefficients from the North Atlantic summertime coccolithophore bloom (2008)
    American Geophysical Union (AGU)
    In:  Geophysical Research Letters, 35 (L23812).
    Details
    Publication Date: 2020-07-30
    Description: Dimethylsulfide (DMS) atmospheric and oceanic concentrations and eddy covariance air/sea fluxes were measured over the N. Atlantic Ocean during July 2007 from Iceland to Woods Hole, MA, USA. Seawater DMS levels north of 55 degrees N ranged from 3 to 17 nM, with variability related to the satellite-derived distributions of coccoliths and to a lesser extent, chlorophyll. For the most intense bloom region southwest of Iceland, DMS air/sea fluxes were as high as 300 mu mol m(-2) d(-1), larger than current model estimates. The observations imply that gas exchange coefficients in this region are significantly greater than those estimated using most gas transfer parameterizations. South of 55 degrees N, DMS levels were lower and the gas transfer coefficients were similar to those observed in other regions of the ocean. The data suggest that DMS emissions from the bloom region may be significantly larger than current estimates. The anomalous gas exchange coefficients likely reflect strong near-surface, water column DMS gradients influenced by physical and biological processes
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Mass balance of the Greenland ice sheet from 1958 to 2007 (2008)
    American Geophysical Union (AGU)
    In:  Geophysical Research Letters, 35 (20). L20502.
    Details
    Publication Date: 2020-07-30
    Description: We combine estimates of the surface mass balance, SMB, of the Greenland ice sheet for years 1958 to 2007 with measurements of the temporal variability in ice discharge, D, to deduce the total ice sheet mass balance. During that time period, we find a robust correlation (R2 = 0.83) between anomalies in SMB and in D, which we use to reconstruct a continuous series of total ice sheet mass balance. We find that the ice sheet was losing 110 ± 70 Gt/yr in the 1960s, 30 ± 50 Gt/yr or near balance in the 1970s–1980s, and 97 ± 47 Gt/yr in 1996 increasing rapidly to 267 ± 38 Gt/yr in 2007. Multi‐year variations in ice discharge, themselves related to variations in SMB, cause 60 ± 20% more variation in total mass balance than SMB, and therefore dominate the ice sheet mass budget.
    Type: Article , PeerReviewed
    Format: text
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