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The Role of Equatorial Pacific Curre...

Zhang, Xiaolin.

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The Role of Equatorial Pacific Currents in El Nino and El Nino Prediction.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The Role of Equatorial Pacific Currents in El Nino and El Nino Prediction./
作者:	Zhang, Xiaolin.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	103 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
Contained By:	Dissertation Abstracts International79-04B(E).
標題:	Physical oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10257040
ISBN:	9780355326147

The Role of Equatorial Pacific Currents in El Nino and El Nino Prediction.
Zhang, Xiaolin.

The Role of Equatorial Pacific Currents in El Nino and El Nino Prediction. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 103 p.

Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.

Thesis (Ph.D.)--The Florida State University, 2017.

Fundamental to an understanding of El Nino/Southern Oscillation climate fluctuations is an understanding of the interannual equatorial Pacific surface flows, which advect the surface waters and change the sea surface temperature. While some knowledge of the observed interannual flows has already been obtained, some key features are still not fully understood. Using the long records of satellite altimeter data, together with long in situ records of current, salinity and temperature from the TAO/TRITON array in the equatorial Pacific, the observed interannual surface flows, their dynamics and link to the El Nino Prediction can be understood better.

ISBN: 9780355326147Subjects--Topical Terms:

3168433
Physical oceanography.

The Role of Equatorial Pacific Currents in El Nino and El Nino Prediction.
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502 $a Thesis (Ph.D.)--The Florida State University, 2017.
520 $a Fundamental to an understanding of El Nino/Southern Oscillation climate fluctuations is an understanding of the interannual equatorial Pacific surface flows, which advect the surface waters and change the sea surface temperature. While some knowledge of the observed interannual flows has already been obtained, some key features are still not fully understood. Using the long records of satellite altimeter data, together with long in situ records of current, salinity and temperature from the TAO/TRITON array in the equatorial Pacific, the observed interannual surface flows, their dynamics and link to the El Nino Prediction can be understood better.
520 $a In the first half of the thesis, I used theoretical arguments and a wind-forced ocean model to understand why the equatorial eastern Pacific flow leads sea level, eastern equatorial thermocline displacement and El Nino indices. This half of the thesis is based on the result that for large zonal scales and low frequencies, wind-forced sea level, even near the equator, can be described by wind-forced long Rossby waves. In the eastern equatorial Pacific where the interannual wind forcing is small, these waves are essentially locally unforced and propagate westward from the boundary. At the boundary the wave's sea level is in phase because of geostrophy and no normal flow to the boundary. However, because the waves propagate more slowly with increasing latitude, west of the boundary lag increases as latitude increases. Consequently a northward sea level gradient is like a time derivative, and the zonal geostrophic flow is like a time derivative of the sea level. This implies that the equatorial flow should lead the equatorial sea level by about 9 months on El Nino time scales. Analysis shows that when dissipation of the large-scale flow is taken into account, this lead is reduced to about 3 months. This lead time is approximately the dissipation time scale of the second vertical mode, which dominates the zonal surface flow. Since the eastern equatorial Pacific sea level etaE is proportional to eastern equatorial thermocline displacement and El Nino, the zonal equatorial flow leads El Nino indices. Analysis further shows that the zonally-averaged equatorial Pacific sea level leads El Nino, and that this lead is associated with the geostrophic zonal velocity and the long Rossby wave physics in the eastern equatorial Pacific.
520 $a The second part of this work addresses the influence of the heavy precipitation on the Western equatorial Pacific Ocean. Surface and subsurface salinity and temperature measurements at 137°E, 147°E, and 156°E since the late 1990s from the western equatorial Pacific TRITON moored array indicate that the large interannual sea surface salinity (SSS) fluctuations there change little with depth over the top 50 m of the water column. Beneath this surface layer the SSS signal decreases, and is usually much smaller at about 100 m depth. The isothermal layer depth (ILD) ranges from about 50--70 m and estimates of dynamic height relative to the ILD indicate a near-surface salinity-driven contribution to the monthly sea level anomaly that is uncorrelated with, and smaller than, interannual sea surface height (SSH) estimated from altimeter data. Despite the smaller size of zeta'F, its meridional gradient dominates the total sea level meridional gradient and thus the corresponding shallow equatorially-trapped interannual fresh water jet u'F dominates the near-surface zonal interannual flow. This jet-like flow has a meridional scale of only about 2--3° of latitude, an amplitude of 23cm/s, and is associated with the zonal back and forth displacement of the western equatorial warm/fresh pool that is fundamental to El Nino. The jet is not forced by the interannual fresh water surface flux but rather by wind stress anomalies that are mostly east of the warm/fresh pool edge during La Nina and mostly west of it during El Nino.
590 $a School code: 0071.
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710 2 $a The Florida State University. $b Earth, Ocean & Atmospheric Science. $3 3187732
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