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Coupling between atmospheric deposit...

Tian, Zhenglong.

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Coupling between atmospheric deposition and oceanic flux of Fe and Al in the Sargasso Sea.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Coupling between atmospheric deposition and oceanic flux of Fe and Al in the Sargasso Sea./
作者:	Tian, Zhenglong.
面頁冊數:	135 p.
附註:	Adviser: Thomas M. Church.
Contained By:	Masters Abstracts International45-03.
標題:	Atmospheric Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1440631

Coupling between atmospheric deposition and oceanic flux of Fe and Al in the Sargasso Sea.
Tian, Zhenglong.

Coupling between atmospheric deposition and oceanic flux of Fe and Al in the Sargasso Sea. - 135 p.

Adviser: Thomas M. Church.

Thesis (M.S.)--University of Delaware, 2007.

It is also indicated by the data that mesopelagic waters serve as an important reservoir of atmospherically derived Fe during the high dust season, and that subsequent removal to the benthos is tightly coupled to the bloom events.Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Coupling between atmospheric deposition and oceanic flux of Fe and Al in the Sargasso Sea.
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245 1 0 $a Coupling between atmospheric deposition and oceanic flux of Fe and Al in the Sargasso Sea.
300 $a 135 p.
500 $a Adviser: Thomas M. Church.
500 $a Source: Masters Abstracts International, Volume: 45-03, page: 1436.
502 $a Thesis (M.S.)--University of Delaware, 2007.
520 $a It is also indicated by the data that mesopelagic waters serve as an important reservoir of atmospherically derived Fe during the high dust season, and that subsequent removal to the benthos is tightly coupled to the bloom events.
520 $a Atmospheric fluxes of Fe and Al have been determined by bulk (wet + dry) deposition, wet deposition and aerosol samples collected at the Bermuda West Tower (BWT) from 1999 to 2001. These depositions collected at the Bermuda Sampling Tower can represent atmospheric fluxes over the adjacent Sargasso Sea. The deposition mode of Fe (wet vs. dry) showed that dry deposition accounts for more than 90% of the total Fe deposition during this sampling period. It is suggested that there appears to be a potential linkage between the deposition mode and the winter North Atlantic Oscillation (NAO) index. The dry deposition velocities (ddv) of Fe-bearing aerosols were estimated from the atmospheric data, and a seasonal variation of ddv was observed. Seasonal changes in aerosol components and local meteorological conditions may cause this variation. During the spring and summer months, the ddv ranged from 0.3 to 1.2 cm/s; however, during the fall and winter months, the ddv ranged from 1.9 to 6.0 cm/s. This indicates that the dry deposition velocity of 1.0 cm/s in the current model of calculating dry deposition could cause a slight overestimation during spring and summer and an underestimation by up to a factor of 6 during the fall and winter months.
520 $a The fate of Fe and Al in the ocean interior, following their atmospheric deposition, was studied by analyzing sediment trap samples collected at 500m, 1500m and 3200m depths from the Oceanic Flux Program (OFP) mooring site. Overall, the sinking fluxes of Fe and Al at 500m depth were mainly influenced by the seasonal cycle of primary production and hydrology in the overlying surface waters. At the deeper depths (1500m and 3200m), decomposition, scavenging and lateral advective processes in the water column, plus the biological activities of mid-water organisms, significantly affect the Fe and Al export flux.
520 $a The comparison of atmospheric Fe and Al deposition to their oceanic fluxes shows a temporal decoupling on a monthly scale but good agreement (within +/-20-30%) on an annual scale. The annual coupling indicates that atmospheric deposition is the most important contributor of Fe and Al to the deep ocean at the OFP mooring site.
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650 4 $a Engineering, Environmental. $3 783782
650 4 $a Engineering, Marine and Ocean. $3 1019064
650 4 $a Environmental Sciences. $3 676987
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710 2 0 $a University of Delaware. $3 1017826
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