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Comparison of Moisture Transport between Siberia and Northeast Asia on Annual and Interannual Time Scales
Stockholm University, Faculty of Science, Department of Physical Geography.
Number of Authors: 42018 (English)In: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442, Vol. 31, no 18, p. 7645-7660Article in journal (Refereed) Published
Abstract [en]

The moisture supplies over Siberia and Northeast Asia are investigated by comparing their similarities and differences, enlightened by the seesaw pattern in their summer precipitation. Based on the rotated empirical orthogonal functions in the 3-month standardized precipitation evapotranspiration index (SPEI_03), Siberia and Northeast Asia are defined as the regions within 55 degrees-70 degrees N, 80 degrees-115 degrees E and 40 degrees-55 degrees N, 90 degrees-115 degrees E, respectively. Our results show that over both regions, evaporation contributes the most to the precipitation amount at the annual time scale, and moisture convergence contributes the most on the interannual time scale. For moisture convergence, both the stationary and transient terms are subject to impacts of the midlatitude westerlies. For the annual cycle, the net moisture supply over both Siberia and Northeast Asia is closely associated with both stationary and transient moisture transport. However, on the interannual time scale, the net moisture convergence is closely related to the stationary term only. The examination of the boundary moisture transport shows that in addition to the zonal component, the meridional stationary moisture transport plays a key role in the net moisture convergence. The transient moisture transport mainly depends on moisture transport through the western and southern boundaries, with a comparable magnitude to that of the stationary one, further confirming the importance of the stationary and transient terms on the moisture supply for the annual cycle. In addition, the circulations responsible for moisture transport anomalies indicate that the stationary moisture circulation is the key factor for the moisture supply anomalies over both Siberia and Northeast Asia, with limited impacts from the transient moisture circulation.

Place, publisher, year, edition, pages
2018. Vol. 31, no 18, p. 7645-7660
Keywords [en]
Climate variability, Evaporation, Moisture, moisture budget, Water vapor, Annual variations, Interannual variability
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-158886DOI: 10.1175/JCLI-D-17-0763.1ISI: 000441124600001OAI: oai:DiVA.org:su-158886DiVA, id: diva2:1240778
Available from: 2018-08-22 Created: 2018-08-22 Last updated: 2018-08-22Bibliographically approved

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