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Earth System Dynamics An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 3 | Copyright
Earth Syst. Dynam., 7, 549-558, 2016
https://doi.org/10.5194/esd-7-549-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Short communication 08 Jul 2016

Short communication | 08 Jul 2016

A Lagrangian analysis of the present-day sources of moisture for major ice-core sites

Anita Drumond1, Erica Taboada2, Raquel Nieto1,3, Luis Gimeno1, Sergio M. Vicente-Serrano4, and Juan Ignacio López-Moreno4 Anita Drumond et al.
  • 1EPhysLab, Facultade de Ciencias, Universidade de Vigo, Ourense, 32004, Spain
  • 2Facultad de Ciencias, Universidad de La Laguna, La Laguna, 38200, Spain
  • 3Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo, 05508-090, Brazil
  • 4Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE-CSIC), Zaragoza, 38200, Spain

Abstract. A Lagrangian approach was used to identify the moisture sources for 14 ice-core sites located worldwide for the period of 1980–2012. The sites were classified into three domains: Arctic, Central (Andes, Alps, and Kilimanjaro), and Antarctic. The approach was used to compute budgets of evaporation minus precipitation by calculating changes in the specific humidity along 10-day backward trajectories. The results indicate that the oceanic regions around the subtropical high-pressure centres provide most of moisture, and their contribution varies throughout the year following the annual cycles of the centres. For the Arctic Domain, the sources lie in the subtropical North Atlantic and Pacific. The subtropical South Atlantic, Indian, and Pacific oceans provide moisture for the Antarctic Domain. The sources for South America are the Atlantic and South Pacific, for Europe the sources are in the Mediterranean and the North Atlantic, and for Asia the sources are the Indian Ocean and the Arabian Sea.

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A Lagrangian approach was used to identify the moisture sources for fourteen ice-core sites located worldwide for the present climate. The approach computed budgets of evaporation minus precipitation by calculating changes in the specific humidity along 10-day backward trajectories. The results indicate that the oceanic regions around the subtropical high-pressure centers provide most of moisture, and their contribution varies throughout the year following the annual cycles of the centers.
A Lagrangian approach was used to identify the moisture sources for fourteen ice-core sites...
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