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Sökning: onr:"swepub:oai:DiVA.org:ltu-81303" > A microphysics guid...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00007733naa a2200565 4500
001oai:DiVA.org:ltu-81303
003SwePub
008201103s2020 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-813032 URI
0247 a https://doi.org/10.5194/acp-20-12569-20202 DOI
040 a (SwePub)ltu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Krämer, Martinau Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany. Institute for Atmospheric Physics (IPA), Johannes Gutenberg University, Mainz, Germany4 aut
2451 0a A microphysics guide to cirrus – Part 2 :b Climatologies of clouds and humidity from observations
264 c 2020-11-02
264 1b Copernicus GmbH,c 2020
338 a print2 rdacarrier
500 a Validerad;2020;Nivå 2;2020-11-03 (johcin)
520 a This study presents airborne in situ and satellite remote sensing climatologies of cirrus clouds and humidity. The climatologies serve as a guide to the properties of cirrus clouds, with the new in situ database providing detailed insights into boreal midlatitudes and the tropics, while the satellite-borne data set offers a global overview.To this end, an extensive, quality-checked data archive, the Cirrus Guide II in situ database, is created from airborne in situ measurements during 150 flights in 24 campaigns. The archive contains meteorological parameters, ice water content (IWC), ice crystal number concentration (Nice), ice crystal mean mass radius (Rice), relative humidity with respect to ice (RHice), and water vapor mixing ratio (H2O) for each of the flights. Depending on the parameter, the database has been extended by about a factor of 5–10 compared to earlier studies.As one result of our investigation, we show that the medians of Nice, Rice, and RHice have distinct patterns in the IWC–T parameter space. Lookup tables of these variables as functions of IWC and T can be used to improve global model cirrus representation and remote sensing retrieval methods. Another outcome of our investigation is that across all latitudes, the thicker liquid-origin cirrus predominate at lower altitudes, while at higher altitudes the thinner in situ-origin cirrus prevail. Further, examination of the radiative characteristics of in situ-origin and liquid-origin cirrus shows that the in situ-origin cirrus only slightly warm the atmosphere, while liquid-origin cirrus have a strong cooling effect.An important step in completing the Cirrus Guide II is the provision of the global cirrus Nice climatology, derived by means of the retrieval algorithm DARDAR-Nice from 10 years of cirrus remote sensing observations from satellite. The in situ measurement database has been used to evaluate and improve the satellite observations. We found that the global median Nice from satellite observations is almost 2 times higher than the in situ median and increases slightly with decreasing temperature. Nice medians of the most frequently occurring cirrus sorted by geographical regions are highest in the tropics, followed by austral and boreal midlatitudes, Antarctica, and the Arctic. Since the satellite climatologies enclose the entire spatial and temporal Nice occurrence, we could deduce that half of the cirrus are located in the lowest, warmest (224–242 K) cirrus layer and contain a significant amount of liquid-origin cirrus.A specific highlight of the study is the in situ observations of cirrus and humidity in the Asian monsoon anticyclone and the comparison to the surrounding tropics. In the convectively very active Asian monsoon, peak values of Nice and IWC of 30 cm−3 and 1000 ppmv are detected around the cold point tropopause (CPT). Above the CPT, ice particles that are convectively injected can locally add a significant amount of water available for exchange with the stratosphere. We found IWCs of up to 8 ppmv in the Asian monsoon in comparison to only 2 ppmv in the surrounding tropics. Also, the highest RHice values (120 %–150 %) inside of clouds and in clear sky are observed around and above the CPT. We attribute this to the high H2O mixing ratios (typically 3–5 ppmv) observed in the Asian monsoon compared to 1.5 to 3 ppmv found in the tropics. Above the CPT, supersaturations of 10 %–20 % are observed in regions of weak convective activity and up to about 50 % in the Asian monsoon. This implies that the water available for transport into the stratosphere might be higher than the expected saturation value.
650 7a TEKNIK OCH TEKNOLOGIERx Maskinteknikx Rymd- och flygteknik0 (SwePub)203022 hsv//swe
650 7a ENGINEERING AND TECHNOLOGYx Mechanical Engineeringx Aerospace Engineering0 (SwePub)203022 hsv//eng
653 a Atmospheric science
653 a Atmosfärsvetenskap
7001 a Rolf, Christianu Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany4 aut
7001 a Spelten, Nicoleu Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany4 aut
7001 a Afchine, Arminu Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany4 aut
7001 a Fahey, Davidu NOAA Chemical Sciences Laboratory (CSL), Boulder, USA4 aut
7001 a Jensen, Ericu NCAR, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, USA4 aut
7001 a Khaykin, Sergeyu LATMOS/IPSL, UVSQ, Sorbonne Université, CNRS, Guyancourt, France4 aut
7001 a Kuhn, Thomas,d 1970-u Luleå tekniska universitet,Rymdteknik4 aut0 (Swepub:ltu)thokuh
7001 a Lawson, Paulu SPEC Inc., Boulder, CO, USA4 aut
7001 a Lykov, Alexeyu Central Aerological Observatory (CAO), Department of Upper Atmospheric Layers Physics, Moscow, Russia4 aut
7001 a Pan, Laura L.u NCAR, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, USA4 aut
7001 a Riese, Martinu Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany4 aut
7001 a Rollins, Andrewu NOAA Chemical Sciences Laboratory (CSL), Boulder, USA4 aut
7001 a Stroh, Fredu Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany4 aut
7001 a Thornberry, Troyu NOAA Chemical Sciences Laboratory (CSL), Boulder, USA. CIRES, University of Colorado Boulder, Boulder, USA4 aut
7001 a Wolf, Veronikau Luleå tekniska universitet,Rymdteknik4 aut0 (Swepub:ltu)verwol
7001 a Woods, Sarahu SPEC Inc., Boulder, CO, USA4 aut
7001 a Spichtinger, Peteru Institute for Atmospheric Physics (IPA), Johannes Gutenberg University, Mainz, Germany4 aut
7001 a Quaas, Johannesu Leipzig Institute for Meteorology (LIM), Universität Leipzig, Leipzig, Germany4 aut
7001 a Sourdeval, Odranu Univ. Lille, CNRS, UMR 8518 – LOA – Laboratoire d'Optique Atmosphérique, Lille, France4 aut
7102 a Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany. Institute for Atmospheric Physics (IPA), Johannes Gutenberg University, Mainz, Germanyb Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany4 org
7730 t Atmospheric Chemistry And Physicsd : Copernicus GmbHg 20:21, s. 12569-12608q 20:21<12569-12608x 1680-7316x 1680-7324
8564 u https://acp.copernicus.org/articles/20/12569/2020/acp-20-12569-2020.pdf
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81303
8564 8u https://doi.org/10.5194/acp-20-12569-2020

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