期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 120, 期 7, 页码 2970-2989出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JD022602
关键词
water isotopes; Greenland; atmospheric river
资金
- IPEV
- ICOS
- CARBOOCEAN project
- ANR CEPS Green Greenland project [ANR-10-CEPL-0008]
- FNRS-CFB in Belgium
- FWO in Belgium
- GSC in Canada
- CAS in China
- FIST in Denmark
- IPEV in France
- INSU/CNRS in France
- ANR VMC NEEM in France
- AWI in Germany
- RannIs in Iceland
- NIPR in Japan
- KOPRI in Korea
- NWO/ALW in Netherlands
- VR in Sweden
- SNF in Switzerland
- NERC in UK
- US NSF, Office of Polar Programs in USA
- Danish Council for Independent Research (Natural Sciences) [10-092850]
- Carlsberg Foundation
- Icelandic Centre for Research [1202340031]
- CIRES
- AXA
- Agence Nationale de la Recherche (ANR) [ANR-10-CEPL-0008] Funding Source: Agence Nationale de la Recherche (ANR)
During 7-12 July 2012, extreme moist and warm conditions occurred over Greenland, leading to widespread surface melt. To investigate the physical processes during the atmospheric moisture transport of this event, we study the water vapor isotopic composition using surface in situ observations in Bermuda Island, South Greenland coast (Ivittuut), and northwest Greenland ice sheet (NEEM), as well as remote sensing observations (Infrared Atmospheric Sounding Interferometer (IASI) instrument on board MetOp-A), depicting propagation of similar surface and midtropospheric humidity and D signals. Simulations using Lagrangian moisture source diagnostic and water tagging in a regional model showed that Greenland was affected by an atmospheric river transporting moisture from the western subtropical North Atlantic Ocean, which is coherent with observations of snow pit impurities deposited at NEEM. At Ivittuut, surface air temperature, humidity, and D increases are observed. At NEEM, similar temperature increase is associated with a large and long-lasting approximate to 100D enrichment and approximate to 15 deuterium excess decrease, thereby reaching Ivittuut level. We assess the simulation of this event in two isotope-enabled atmospheric general circulation models (LMDz-iso and ECHAM5-wiso). LMDz-iso correctly captures the timing of propagation for this event identified in IASI data but depict too gradual variations when compared to surface data. Both models reproduce the surface meteorological and isotopic values during the event but underestimate the background deuterium excess at NEEM. Cloud liquid water content parametrization in LMDz-iso poorly impacts the vapor isotopic composition. Our data demonstrate that during this atmospheric river event the deuterium excess signal is conserved from the moisture source to northwest Greenland. Key Points
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