Atmospheric Moisture Sources, Paths, and the Quantitative Importance to the Eastern Asian Monsoon Region

L. Li, A.J. Dolman, Z. Xu

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A Lagrangian model [Flexible Particle dispersion model (FLEXPART)] was used to calculate the back trajectories of air parcels residing over the East Asian monsoon region (EAM) for a 4-yr period (2009-12). To detect the moisture source-sink relationships to the EAM, the moisture budgets [evaporation minus precipitation (E - P)] were evaluated by diagnosing the changes of specific humidity along the trajectories. A circulation constraint method was proposed to define the moisture sources of the EAM, to quantify their importance, to depict the moisture transport processes, and to reveal the fate of the moisture from different sources. The results indicated that in winter the largest airmass inflow is through the dry westerlies, but they do not form net precipitation. The much smaller contribution of the tropical oceans is more relevant to winter precipitation. In summer, the main contribution was through the southwest monsoon, with a mean specific humidity of 9.8 g kg
Original languageEnglish
Article number2
Pages (from-to)637-649
JournalJournal of Hydrometeorology
Issue number17
DOIs
Publication statusPublished - 2016

Fingerprint

atmospheric moisture
monsoon
moisture
humidity
trajectory
winter
transport process
inflow
evaporation
air
ocean
summer

Cite this

@article{a935423171c147659b705af42a6a15e9,
title = "Atmospheric Moisture Sources, Paths, and the Quantitative Importance to the Eastern Asian Monsoon Region",
abstract = "A Lagrangian model [Flexible Particle dispersion model (FLEXPART)] was used to calculate the back trajectories of air parcels residing over the East Asian monsoon region (EAM) for a 4-yr period (2009-12). To detect the moisture source-sink relationships to the EAM, the moisture budgets [evaporation minus precipitation (E - P)] were evaluated by diagnosing the changes of specific humidity along the trajectories. A circulation constraint method was proposed to define the moisture sources of the EAM, to quantify their importance, to depict the moisture transport processes, and to reveal the fate of the moisture from different sources. The results indicated that in winter the largest airmass inflow is through the dry westerlies, but they do not form net precipitation. The much smaller contribution of the tropical oceans is more relevant to winter precipitation. In summer, the main contribution was through the southwest monsoon, with a mean specific humidity of 9.8 g kg",
author = "L. Li and A.J. Dolman and Z. Xu",
year = "2016",
doi = "10.1175/JHM-D-15-0082.1",
language = "English",
pages = "637--649",
journal = "Journal of Hydrometeorology",
issn = "1525-7541",
publisher = "American Meteorological Society",
number = "17",

}

Atmospheric Moisture Sources, Paths, and the Quantitative Importance to the Eastern Asian Monsoon Region. / Li, L.; Dolman, A.J.; Xu, Z.

In: Journal of Hydrometeorology, No. 17, 2, 2016, p. 637-649.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Atmospheric Moisture Sources, Paths, and the Quantitative Importance to the Eastern Asian Monsoon Region

AU - Li, L.

AU - Dolman, A.J.

AU - Xu, Z.

PY - 2016

Y1 - 2016

N2 - A Lagrangian model [Flexible Particle dispersion model (FLEXPART)] was used to calculate the back trajectories of air parcels residing over the East Asian monsoon region (EAM) for a 4-yr period (2009-12). To detect the moisture source-sink relationships to the EAM, the moisture budgets [evaporation minus precipitation (E - P)] were evaluated by diagnosing the changes of specific humidity along the trajectories. A circulation constraint method was proposed to define the moisture sources of the EAM, to quantify their importance, to depict the moisture transport processes, and to reveal the fate of the moisture from different sources. The results indicated that in winter the largest airmass inflow is through the dry westerlies, but they do not form net precipitation. The much smaller contribution of the tropical oceans is more relevant to winter precipitation. In summer, the main contribution was through the southwest monsoon, with a mean specific humidity of 9.8 g kg

AB - A Lagrangian model [Flexible Particle dispersion model (FLEXPART)] was used to calculate the back trajectories of air parcels residing over the East Asian monsoon region (EAM) for a 4-yr period (2009-12). To detect the moisture source-sink relationships to the EAM, the moisture budgets [evaporation minus precipitation (E - P)] were evaluated by diagnosing the changes of specific humidity along the trajectories. A circulation constraint method was proposed to define the moisture sources of the EAM, to quantify their importance, to depict the moisture transport processes, and to reveal the fate of the moisture from different sources. The results indicated that in winter the largest airmass inflow is through the dry westerlies, but they do not form net precipitation. The much smaller contribution of the tropical oceans is more relevant to winter precipitation. In summer, the main contribution was through the southwest monsoon, with a mean specific humidity of 9.8 g kg

U2 - 10.1175/JHM-D-15-0082.1

DO - 10.1175/JHM-D-15-0082.1

M3 - Article

SP - 637

EP - 649

JO - Journal of Hydrometeorology

JF - Journal of Hydrometeorology

SN - 1525-7541

IS - 17

M1 - 2

ER -