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Emissions from China: Implications f...

Wang, Yuxuan.

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Emissions from China: Implications for the regional and global environment.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Emissions from China: Implications for the regional and global environment./
作者:	Wang, Yuxuan.
面頁冊數:	163 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0320.
Contained By:	Dissertation Abstracts International66-01B.
標題:	Physics, Atmospheric Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3161203
ISBN:	049694911X

Emissions from China: Implications for the regional and global environment.
Wang, Yuxuan.

Emissions from China: Implications for the regional and global environment. - 163 p.

Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0320.

Thesis (Ph.D.)--Harvard University, 2005.

Rapid industrial development over the past 20 years in East Asia and specifically in China has resulted in unprecedented growth in emission of important gases with implications for both the global and regional environment. An important objective of this thesis is to define the nature and extent of these emissions. I developed a one-way nested grid capability in a global 3-D chemical transport model (GEOS-CHEM). The nested grid methodology allows us to simulate the chemistry of East Asia with relatively high spatial resolution (resolution 1° x 1°) while at the same time preserving the ability of the model to simulate the interaction of this region with the larger global environment (resolution 4° x 5°). Comparisons between model results obtained using different resolutions suggest that the higher resolution nested-grid model allows for more efficient, advection-related, ventilation of the lower atmosphere, reflecting the significance of localized regions of intense upward motion not resolved in a coarser-resolution simulation.

ISBN: 049694911XSubjects--Topical Terms:

1019431
Physics, Atmospheric Science.

Emissions from China: Implications for the regional and global environment.
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520 $a Rapid industrial development over the past 20 years in East Asia and specifically in China has resulted in unprecedented growth in emission of important gases with implications for both the global and regional environment. An important objective of this thesis is to define the nature and extent of these emissions. I developed a one-way nested grid capability in a global 3-D chemical transport model (GEOS-CHEM). The nested grid methodology allows us to simulate the chemistry of East Asia with relatively high spatial resolution (resolution 1° x 1°) while at the same time preserving the ability of the model to simulate the interaction of this region with the larger global environment (resolution 4° x 5°). Comparisons between model results obtained using different resolutions suggest that the higher resolution nested-grid model allows for more efficient, advection-related, ventilation of the lower atmosphere, reflecting the significance of localized regions of intense upward motion not resolved in a coarser-resolution simulation.
520 $a The nested-grid model is shown to provide good agreement with measurements of CO made during the NASA TRansport And Chemical Evolution over the Pacific (TRACE-P) aircraft campaign in spring 2001. Budget analysis suggests that horizontal advection, mainly through the north boundary, contributes a net source of CO to the study domain despite the polluted nature of the East Asia region. The major sink for CO in the lower atmosphere is upward transfer to higher altitudes through large scale advection and convection. Lifting ahead of southeastward-moving cold fronts is responsible for an important pathway transporting CO emitted from southern China to the free troposphere in springtime.
520 $a Observations of CO and NOy from the TRACE-P mission, and from two Chinese ground stations (Hong Kong and Lin An) during spring 2001 are used in conjunction with an optimal estimation inverse model to constrain estimates of Asian emissions of CO and NOx. The inversion analysis requires 43% and 47% increases in Chinese emissions of CO and NOx respectively, distributed heterogeneously, with the largest adjustments required for central China. While our inversion results for CO are consistent with the conclusions independently reached in an ongoing revision of 'bottom-up' emissions for CO over China, the increase in NOx emissions inferred for Central China is too large to be accommodated by any reasonable adjustment in combustion sources. We proposed that the missing source of NOx may be associated significantly with microbially mediated decomposition of nitrogen associated with the agriculture/animal/human food chain. (Abstract shortened by UMI.)
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