TY - JOUR
T1 - Cloud distributions over the coastal Arctic Ocean
T2 - Surface-based and satellite observations
AU - Key, Erica L.
AU - Minnett, Peter J.
AU - Jones, Robert A.
N1 - Funding Information:
The support of the Captains, Officers and Crews of the USGCG Polar Sea, USGCG Polar Star and CCGS Pierre Radisson is gratefully acknowledged, as is the support of sea-going colleagues from RSMAS. The staff of the Canadian Polar Continental Shelf Project is thanked for their logistical support. The Cape Herschel Ice Camp all-sky camera was installed and maintained by Dr. T.N Papakyriakou et al. from the University of Manitoba and their contribution to this study is acknowledged. The field work was supported by funding from the National Science Foundation (DPP 9113962 and OPP9708045) and the National Aeronautics and Space Administration (NAG56577 and NAS5-31361).
PY - 2004
Y1 - 2004
N2 - All-weather Arctic cloud analyses primarily derived from a surface-based hemispheric all-sky imager are compared against ISCCP D-1 cloud amount, type, and phase during the sunlit polar season. Increasing surface temperatures and decreasing ice cover over the past decade have altered heat and moisture fluxes around the Arctic, providing conditions more conducive for cloud generation. Shipboard and ice camp measurements from field experiments conducted over an 8-year period show cloudy skies in 70-95% of the record. Most of these occurrences are stratiform or multi-level, multi-form cloud, increasing in amount with time through the season. Collocated ISCCP retrievals underestimate cloud amount at small solar zenith angles and overestimate at large angles, sometimes by as much as 50%. Satellite assessments of cloud form classify 95% of scenes as having multiple cloud types, the majority of which are mid-level ice cloud and low-level liquid cloud. Despite large discrepancies in diurnal cloud amount, regional averages of ISCCP pixel cloudiness over the length of the experiments agree within ±5% of surface observations.
AB - All-weather Arctic cloud analyses primarily derived from a surface-based hemispheric all-sky imager are compared against ISCCP D-1 cloud amount, type, and phase during the sunlit polar season. Increasing surface temperatures and decreasing ice cover over the past decade have altered heat and moisture fluxes around the Arctic, providing conditions more conducive for cloud generation. Shipboard and ice camp measurements from field experiments conducted over an 8-year period show cloudy skies in 70-95% of the record. Most of these occurrences are stratiform or multi-level, multi-form cloud, increasing in amount with time through the season. Collocated ISCCP retrievals underestimate cloud amount at small solar zenith angles and overestimate at large angles, sometimes by as much as 50%. Satellite assessments of cloud form classify 95% of scenes as having multiple cloud types, the majority of which are mid-level ice cloud and low-level liquid cloud. Despite large discrepancies in diurnal cloud amount, regional averages of ISCCP pixel cloudiness over the length of the experiments agree within ±5% of surface observations.
KW - AVHRR
KW - Arctic environment
KW - Clouds
KW - Spatial distribution
KW - Temporal distribution
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U2 - 10.1016/j.atmosres.2004.03.029
DO - 10.1016/j.atmosres.2004.03.029
M3 - Article
AN - SCOPUS:8644268048
VL - 72
SP - 57
EP - 88
JO - Journal de Recherches Atmospheriques
JF - Journal de Recherches Atmospheriques
SN - 0169-8095
IS - 1-4
ER -