Universität zu Köln

Nomokonova, Tatiana, Ebell, Kerstin, Loehnert, Ulrich, Maturilli, Marion ORCID: 0000-0001-6818-7383 and Ritter, Christoph (2020). The influence of water vapor anomalies on clouds and their radiative effect at Ny-Alesund. Atmos. Chem. Phys., 20 (8). S. 5157 - 5174. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1680-7324

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Abstract

The occurrence of events with increased and decreased integrated water vapor (IWV) at the Arctic site Ny-Alesund, their relation to cloud properties, and the surface cloud radiative effect (CRE) is investigated. For this study, we used almost 2.5 years (from June 2016 to October 2018) of ground-based cloud observations processed with the Cloudnet algorithm, IWV from a microwave radiometer (MWR), long-term radiosonde observations, and backward trajectories FLEXTRA. Moist and dry anomalies were found to be associated with North Atlantic flows and air transport within the Arctic region, respectively. The amount of water vapor is often correlated to cloud occurrence, presence of cloud liquid water, and liquid water path (LWP) and ice water path (IWP). In turn, changes in the cloud properties cause differences in surface CRE. During dry anomalies, in autumn, winter, and spring, the mean net surface CRE was lower by 2-37 W M-2 with respect to normal conditions, while in summer the cloud-related surface cooling was reduced by 49 W m(-2). In contrast, under moist conditions in summer the mean net surface CRE becomes more negative by 25 W m(-2), while in other seasons the mean net surface CRE was increased by 5-37 W m(-2). Trends in the occurrence of dry and moist anomalies were analyzed based on a 25-year radiosonde database. Dry anomalies have become less frequent, with rates for different seasons ranging from -12.8 % per decade to -4 % per decade, while the occurrence of moist events has increased at rates from 2.8 % per decade to 6.4 % per decade.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Nomokonova, Tatiana UNSPECIFIED UNSPECIFIED UNSPECIFIED Ebell, Kerstin UNSPECIFIED UNSPECIFIED UNSPECIFIED Loehnert, Ulrich UNSPECIFIED UNSPECIFIED UNSPECIFIED Maturilli, Marion UNSPECIFIED orcid.org/0000-0001-6818-7383 UNSPECIFIED Ritter, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-336144
DOI:	10.5194/acp-20-5157-2020
Journal or Publication Title:	Atmos. Chem. Phys.
Volume:	20
Number:	8
Page Range:	S. 5157 - 5174
Date:	2020
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1680-7324
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEAT-TRANSPORT; SURFACE ALBEDO; TEMPERATURE; AMPLIFICATION; ACCURACY; IMPACT; PHASE; MODEL; TRAJECTORIES; STATISTICS Multiple languages Environmental Sciences; Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33614