Meteorological conditions in the Central Arctic summer during the arctic summer cloud ocean study (ascos)

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Fältnamn	Indikatorer	Metadata
000		04105naa a2200445 4500
001		oai:DiVA.org:su-81706
003		SwePub
008		121030s2012 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-817062 URI
024	7	a https://doi.org/10.5194/acp-12-6863-20122 DOI
040		a (SwePub)su
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Tjernström, Michaelu Stockholms universitet,Meteorologiska institutionen (MISU)4 aut0 (Swepub:su)tjern
245	1 0	a Meteorological conditions in the Central Arctic summer during the arctic summer cloud ocean study (ascos)
264		c 2012-08-01
264	1	b Copernicus GmbH,c 2012
338		a print2 rdacarrier
500		a AuthorCount:11;
520		a Understanding the rapidly changing climate in the Arctic is limited by a lack of understanding of underlying strong feedback mechanisms that are specific to the Arctic. Progress in this field can only be obtained by process-level observations; this is the motivation for intensive ice-breaker-based campaigns such as the Arctic Summer Cloud-Ocean Study (ASCOS), described here. However, detailed field observations also have to be put in the context of the larger-scale meteorology, and short field campaigns have to be analysed within the context of the underlying climate state and temporal anomalies from this. To aid in the analysis of other parameters or processes observed during this campaign, this paper provides an overview of the synoptic-scale meteorology and its climatic anomaly during the ASCOS field deployment. It also provides a statistical analysis of key features during the campaign, such as key meteorological variables, the vertical structure of the lower troposphere and clouds, and energy fluxes at the surface. In order to assess the representativity of the ASCOS results, we also compare these features to similar observations obtained during three earlier summer experiments in the Arctic Ocean: the AOE-96, SHEBA and AOE-2001 expeditions. We find that these expeditions share many key features of the summertime lower troposphere. Taking ASCOS and the previous expeditions together, a common picture emerges with a large amount of low-level cloud in a well-mixed shallow boundary layer, capped by a weak to moderately strong inversion where moisture, and sometimes also cloud top, penetrate into the lower parts of the inversion. Much of the boundary-layer mixing is due to cloud-top cooling and subsequent buoyant overturning of the cloud. The cloud layer may, or may not, be connected with surface processes depending on the depths of the cloud and surface-based boundary layers and on the relative strengths of surface-shear and cloud-generated turbulence. The latter also implies a connection between the cloud layer and the free troposphere through entrainment at cloud top.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Meteorologi och atmosfärforskning0 (SwePub)105082 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Meteorology and Atmospheric Sciences0 (SwePub)105082 hsv//eng
700	1	a Birch, C. E.4 aut
700	1	a Brooks, I. M.4 aut
700	1	a Shupe, M. D.4 aut
700	1	a Persson, P. O. G.4 aut
700	1	a Sedlar, J.4 aut
700	1	a Mauritsen, T.4 aut
700	1	a Leck, Carolineu Stockholms universitet,Meteorologiska institutionen (MISU)4 aut0 (Swepub:su)leck
700	1	a Paatero, J.4 aut
700	1	a Szczodrak, M.4 aut
700	1	a Wheeler, C. R.4 aut
710	2	a Stockholms universitetb Meteorologiska institutionen (MISU)4 org
773	0	t Atmospheric Chemistry And Physicsd : Copernicus GmbHg 12:15, s. 6863-6889q 12:15<6863-6889x 1680-7316x 1680-7324
856	4	u https://doi.org/10.5194/acp-12-6863-2012y Fulltext
856	4	u https://www.atmos-chem-phys.net/12/6863/2012/acp-12-6863-2012.pdf
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-81706
856	4 8	u https://doi.org/10.5194/acp-12-6863-2012

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Av författaren/redakt...: Tjernström, Mich ...; Birch, C. E.; Brooks, I. M.; Shupe, M. D.; Persson, P. O. G ...; Sedlar, J.; visa fler...; Mauritsen, T.; Leck, Caroline; Paatero, J.; Szczodrak, M.; Wheeler, C. R.; visa färre...

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