Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation
We provide the first continuous measurements of isotopic composition (D and O-18) of water vapor over the subtropical Eastern North Atlantic Ocean from mid-August to mid-September 2012. The ship was located mostly around 26 degrees N, 35 degrees W where evaporation exceeded by far precipitation and...
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ftird:oai:ird.fr:fdi:010061957 2023-05-15T17:34:11+02:00 Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation Benetti, M. Reverdin, G. Pierre, C. Merlivat, L. Risi, C. Steen-Larsen, H. C. Vimeux, Françoise ATLANTIQUE NORD EST 2014 http://www.documentation.ird.fr/hor/fdi:010061957 EN eng http://www.documentation.ird.fr/hor/fdi:010061957 oai:ird.fr:fdi:010061957 Benetti M., Reverdin G., Pierre C., Merlivat L., Risi C., Steen-Larsen H. C., Vimeux Françoise. Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation. Journal of Geophysical Research.Atmospheres, 2014, 119 (2), p. 584-593. Deuterium excess evaporation wind speed surface roughness text 2014 ftird 2020-08-21T06:53:43Z We provide the first continuous measurements of isotopic composition (D and O-18) of water vapor over the subtropical Eastern North Atlantic Ocean from mid-August to mid-September 2012. The ship was located mostly around 26 degrees N, 35 degrees W where evaporation exceeded by far precipitation and water vapor at 20m largely originated from surface evaporation. The only large deviations from that occurred during a 2 day period in the vicinity of a weak low-pressure system. The continuous measurements were used to investigate deuterium excess (d-excess) relation to evaporation. During 25 days d-excess was negatively correlated with relative humidity (r(2)=0.89). Moreover, d-excess estimated in an evaporative model with a closure assumption reproduced most of the observed variability. From these observations, the d-excess parameter seems to be a good indicator of evaporative conditions. We also conclude that in this region, d-excess into the marine boundary layer is less affected by mixing with the free troposphere than the isotopic composition. From our data, the transition from smooth to rough regime at the ocean surface is associated with a d-excess decrease of 5, which suggests the importance of the ocean surface roughness in controlling d-excess in this region. Text North Atlantic IRD (Institute de recherche pour le développement): Horizon |
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IRD (Institute de recherche pour le développement): Horizon |
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English |
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Deuterium excess evaporation wind speed surface roughness |
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Deuterium excess evaporation wind speed surface roughness Benetti, M. Reverdin, G. Pierre, C. Merlivat, L. Risi, C. Steen-Larsen, H. C. Vimeux, Françoise Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation |
topic_facet |
Deuterium excess evaporation wind speed surface roughness |
description |
We provide the first continuous measurements of isotopic composition (D and O-18) of water vapor over the subtropical Eastern North Atlantic Ocean from mid-August to mid-September 2012. The ship was located mostly around 26 degrees N, 35 degrees W where evaporation exceeded by far precipitation and water vapor at 20m largely originated from surface evaporation. The only large deviations from that occurred during a 2 day period in the vicinity of a weak low-pressure system. The continuous measurements were used to investigate deuterium excess (d-excess) relation to evaporation. During 25 days d-excess was negatively correlated with relative humidity (r(2)=0.89). Moreover, d-excess estimated in an evaporative model with a closure assumption reproduced most of the observed variability. From these observations, the d-excess parameter seems to be a good indicator of evaporative conditions. We also conclude that in this region, d-excess into the marine boundary layer is less affected by mixing with the free troposphere than the isotopic composition. From our data, the transition from smooth to rough regime at the ocean surface is associated with a d-excess decrease of 5, which suggests the importance of the ocean surface roughness in controlling d-excess in this region. |
format |
Text |
author |
Benetti, M. Reverdin, G. Pierre, C. Merlivat, L. Risi, C. Steen-Larsen, H. C. Vimeux, Françoise |
author_facet |
Benetti, M. Reverdin, G. Pierre, C. Merlivat, L. Risi, C. Steen-Larsen, H. C. Vimeux, Françoise |
author_sort |
Benetti, M. |
title |
Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation |
title_short |
Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation |
title_full |
Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation |
title_fullStr |
Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation |
title_full_unstemmed |
Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation |
title_sort |
deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation |
publishDate |
2014 |
url |
http://www.documentation.ird.fr/hor/fdi:010061957 |
op_coverage |
ATLANTIQUE NORD EST |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010061957 oai:ird.fr:fdi:010061957 Benetti M., Reverdin G., Pierre C., Merlivat L., Risi C., Steen-Larsen H. C., Vimeux Françoise. Deuterium excess in marine water vapor : dependency on relative humidity and surface wind speed during evaporation. Journal of Geophysical Research.Atmospheres, 2014, 119 (2), p. 584-593. |
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