World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Temporal Evolution of Stable Water Isotopologues in Cloud Droplets During Hcct-2010 : Volume 12, Issue 6 (14/06/2012)

By Spiegel, J. K.

Click here to view

Book Id: WPLBN0003996172
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Temporal Evolution of Stable Water Isotopologues in Cloud Droplets During Hcct-2010 : Volume 12, Issue 6 (14/06/2012)  
Author: Spiegel, J. K.
Volume: Vol. 12, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Eugster,, Pinxteren, S. V., Spiegel, J. K., Herrmann, R. A., L. Collett Jr, T. J., Mertes, A.,...Buchmann, W. (2012). Temporal Evolution of Stable Water Isotopologues in Cloud Droplets During Hcct-2010 : Volume 12, Issue 6 (14/06/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute of Agricultural Sciences, ETH Zurich, Zurich, Switzerland. In this work, we present the first study resolving the temporal evolution of Δ2H and Δ18O values in cloud droplets during the course of 13 different cloud events. The cloud events were probed on a 937 m high mountain chain in Germany in the framework of the Hill Cap Cloud Thuringia 2010 campaign (HCCT-2010) in September and October 2010. Δ values of cloud droplets ranged from −77‰ to −15‰ (Δ2H ) and from −12.1‰ to −3.9‰ (Δ18O) over the whole campaign. The cloud water line of the measured Δ values was Δ2H=7.8×Δ18O+13×10−3 which is of similar slope but with higher deuterium excess (d-excess) than Central European Meteoric Water Lines. While seasonality was reflected in decreasing Δ values towards the colder season, d-excess of cloud samples was an indicator of air mass origin: polar air masses had a higher d-excess than Mediterranean air masses. The variations in Δ values during one cloud event could either result from changes in meteorological conditions during condensation or from variations in Δ values of the water vapor feeding the cloud. To test which of both aspect dominated during the measured cloud events, we modeled the variation in Δ values in cloud water using a closed box model. We could show that the variation in Δ values of two cloud events was mainly due to changes in local temperature conditions. For the other eleven cloud events the variation was most likely caused by changes in the isotopic composition of the advected and entrained vapor. Frontal passages led to the highest gradients both in Δ2H (≈6‰ per hour) and Δ18O (≈0.6‰ per hour) during two of the latter cloud events. Moreover, a detailed trajectory analysis for the two longest cloud events revealed that variations in the entrained vapor were most likely related to rain out or changes in relative humidity and temperature at the moisture source region or both. This study illustrates the sensitivity of stable isotope composition of cloud water to changes in large scale air mass properties.

Summary
Temporal evolution of stable water isotopologues in cloud droplets during HCCT-2010

Excerpt
Araguas-Araguas, L., Danesi, P., Froehlich, K., and Rozanski, K.: Global monitoring of the isotopic composition of precipitation, J. Radioanal. Nucl. Chem., 205, 189–200, 1996.; Arends, B. G., Kos, G. P. A., Maser, R., Schell, D., Wobrock, W., Winkler, P., Ogren, J. A., Noone, K. J., Hallberg, A., Svenningsson, I. B., Wiedensohler, A., Hansson, H. C., Berner, A., Solly, I., and Kruisz, C.: Microphysics of clouds at Kleiner Feldberg, J. Atmos. Chem., 19, 59–85, doi:10.1007/BF00696583, 1994.; Cappa, C. D.: Isotopic fractionation of water during evaporation, J. Geophys. Res., 108, 4525, doi:10.1029/2003JD003597, 2003.; Coplen, T.: Guidelines and recommended terms for expression of stable-isotope-ratio and gas-ratio measurement results, Rapid Commun. Mass Spectrom., 25, 2538–2560, doi:10.1002/rcm.5129, 2011.; Corbin, J. D., Thomsen, M. A., Dawson, T. E., and D'Antonio, C. M.: Summer water use by California coastal prairie grasses: fog, drought, and community composition, Oecologia, 145, 511–21, doi:10.1007/s00442-005-0152-y, 2005.; Craig, H.: Isotopic variations in meteoric waters, Science, 133, 1702, 1961.; Craig, H. and Gordon, L.: Deuterium and Oxygen-18 Variations in the Ocean and Marine Atmosphere, in: Stable Isotopes in Oceanic Studies and Paleotemperatures, edited by: Tongiorgi, E., 9–130, Consiglio Nazionale delle Richerche, Pisa, Italy, 1965.; Criss, R. E.: Principles of Stable Isotope Distribution, Oxford University Press, Oxford, 1999.; Dansgaard, W.: Stable isotopes in precipitation, Tellus, 16, 436–468, 1964.; Dansgaard, W., Johnsen, S., Clausen, H., Dahl-Jensen, D., Gundestrup, N., Hammer, C., Hvidberg, C., Steffensen, J., Sveinbjörnsdottir, A., Jouzel, J., and Bond, G.: Evidence for general instability of past climate from a 250-kyr ice-core record, Nature, 364, 218–220, 1993.; Dawson, T. E.: Fog in the California redwood forest: ecosystem inputs and use by plants, Oecologia, 117, 476–485, doi:10.1007/s004420050683, 1998.; Demoz, B., Collett Jr., J. L., and Daube Jr., B.: On the Caltech active strand cloudwater collectors, Atmos. Res., 41, 47–62, doi:10.1016/0169-8095(95)00044-5, 1996.; Draxler, R.: Evaluation of an ensemble dispersion calculation, J. Appl. Meteor., 42, 308–317, 2003.; Draxler, R. and Hess, G.: Description of the HYSPLIT4 modeling system. NOAA Tech. Memo. ERL ARL-224, Tech. Rep. August 2002, Air Resources Laboratory Silver Spring, Maryland, 1997.; Draxler, R. and Hess, G.: An overview of the HYSPLIT_4 modelling system for trajectories, dispersion, and deposition, Aust. Meteor. Mag., 47, 295–308, 1998.; Facy, L., Merlivat, L., Nief, G., and Roth, R.: The study of formation of hailstones by isotopic analysis, J. Geophys. Res., 68, 3841–3848, 1963.; Farquhar, G. D., Cernusak, L. A., and Barnes, B.: Heavy water fractionation during transpiration., Plant Physiol., 143, 11–8, doi:10.1104/pp.106.093278, 2007.; Feild, T. S. and Dawson, T. E.: Water sources used by Didymopanax pittieri at different life stages in a tropical cloud forest, Ecology, 79, 1448, doi:10.2307/176756, 1998.; Fischer, D. T. and Still, C. J.: Evaluating patterns of fog water deposition and isotopic composition on the California Channel Islands, Water Resour. Res., 43, doi:10.1029/2006WR0

 

Click To View

Additional Books


  • Empirical Predictions of Ccn from Aeroso... (by )
  • Contributions of Anthropogenic and Natur... (by )
  • The Millennium Water Vapour Drop in Chem... (by )
  • Global Model Simulations of Air Pollutio... (by )
  • The Impact of Weather and Atmospheric Ci... (by )
  • How Does Deposition of Gas Phase Species... (by )
  • Introduction to the European Monitoring ... (by )
  • Towards a Better Representation of the S... (by )
  • Turbulent Dispersion in Cloud-topped Bou... (by )
  • Climatology of Stratocumulus Cloud Morph... (by )
  • Synergetic Monitoring of Saharan Dust Pl... (by )
  • Occurrence of Lower Cloud Albedo in Ship... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.