TY - JOUR
T1 - Continuous monitoring of summer surface water vapor isotopic composition above the Greenland Ice Sheet
AU - Steen-Larsen, Hans Christian
AU - Johnsen, Sigfus Johann
AU - Masson-Delmotte, V.
AU - Stenni, B.
AU - Risi, null
AU - Balslev-Clausen, David Morten
AU - Blunier, Thomas
AU - Dahl-Jensen, Dorthe
AU - Ellehøj, Mads Dam
AU - Falourd, S.
AU - Grinsted, Aslak
AU - Gkinis, Vasileios
AU - Jouzel, J.
AU - Popp, Trevor James
AU - Sheldon, S.
AU - Simonsen, Sebastian Bjerregaard
AU - Sjolte, Jesper
AU - Steffensen, Jørgen Peder
AU - Sperlich, Peter
AU - Sveinbjornsdottir, A.E.
AU - Vinther, Bo Møllesøe
AU - White, J.W.C.
PY - 2013/5/13
Y1 - 2013/5/13
N2 - We present here surface water vapor isotopic measurements conducted from June to August 2010 at the NEEM (North Greenland Eemian Drilling Project) camp, NW Greenland (77.45° N, 51.05° W, 2484 m a.s.l.). Measurements were conducted at 9 different heights from 0.1 m to 13.5 m above the snow surface using two different types of cavity-enhanced near-infrared absorption spectroscopy analyzers. For each instrument specific protocols were developed for calibration and drift corrections. The inter-comparison of corrected results from different instruments reveals excellent reproducibility, stability, and precision with a standard deviations of ∼0.23‰ for δ18O and ∼1.4‰ for δD. Diurnal and intraseasonal variations show strong relationships between changes in local surface humidity and water vapor isotopic composition, and with local and synoptic weather conditions. This variability probably results from the interplay between local moisture fluxes, linked with firn-air exchanges, boundary layer dynamics, and large-scale moisture advection. Particularly remarkable are several episodes characterized by high (> 40 ‰) surface water vapor deuterium excess. Air mass back-trajectory calculations from atmospheric analyses and watv e er tagging in the LMDZiso (Laboratory of Meteorology Dynamics Zoom-isotopic) atmospheric model reveal that these events are associated with predominant Arctic air mass origin. The analysis suggests that high deuterium excess leveo l ls are a result of strong kinetic fractionation during eva aporation at the sea-ice margin.
AB - We present here surface water vapor isotopic measurements conducted from June to August 2010 at the NEEM (North Greenland Eemian Drilling Project) camp, NW Greenland (77.45° N, 51.05° W, 2484 m a.s.l.). Measurements were conducted at 9 different heights from 0.1 m to 13.5 m above the snow surface using two different types of cavity-enhanced near-infrared absorption spectroscopy analyzers. For each instrument specific protocols were developed for calibration and drift corrections. The inter-comparison of corrected results from different instruments reveals excellent reproducibility, stability, and precision with a standard deviations of ∼0.23‰ for δ18O and ∼1.4‰ for δD. Diurnal and intraseasonal variations show strong relationships between changes in local surface humidity and water vapor isotopic composition, and with local and synoptic weather conditions. This variability probably results from the interplay between local moisture fluxes, linked with firn-air exchanges, boundary layer dynamics, and large-scale moisture advection. Particularly remarkable are several episodes characterized by high (> 40 ‰) surface water vapor deuterium excess. Air mass back-trajectory calculations from atmospheric analyses and watv e er tagging in the LMDZiso (Laboratory of Meteorology Dynamics Zoom-isotopic) atmospheric model reveal that these events are associated with predominant Arctic air mass origin. The analysis suggests that high deuterium excess leveo l ls are a result of strong kinetic fractionation during eva aporation at the sea-ice margin.
U2 - 10.5194/acp-13-4815-2013
DO - 10.5194/acp-13-4815-2013
M3 - Journal article
SN - 1680-7316
VL - 13
SP - 4815
EP - 4828
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
IS - 9
ER -