检索结果-南通市图书馆

Evaluation of Mid-Depth Currents of NCEP Reanalysis Data in the Tropical Pacific Using argo Float Position Information

引用

Advances in Atmospheric Sciences 2005年第5期22卷 677-684页

作者：谢基平朱江许黎郭品文 Institute of Atmospheric Physics Chinese Academy of Sciences Department of Meteorology Nanjing University of Information Science & Technology Nanjing 210044 Department of Meteorology Nanjing University of Information Science & Technology

The global project of the Array for Real-time Geostrophic Oceanography （argo） provides a unique opportunity to observe the absolute velocity in mid-depths of the world oceans. A total of 1597 velocity vectors at 1000 （2000） db in the tropical Pacific derived from the argo float position information during the period November 2001 to October 2004 are used to evaluate the intermediate currents of the National Centers for Environmental Prediction reanalysis. To derive reliable velocity information from argo float trajectory points, a rigorous quality control scheme is applied, and by virtue of a correction method for reducing the drift error on the surface in obtaining the velocity vectors, their relative errors are less than 25%. Based on the comparisons from the quantitative velocity vectors and from the space-time average currents, some substantial discrepancies are revealed. The first is that the velocities of the reanalysis at mid-depths except near the equator are underestimated relative to the observed velocities by the floats. The average speed difference between NCEP and argo values ranges from about -2.3cm s^-1 to -1.8 cm s^-1. The second is that the velocity difference between the ocean model and the observations at 2000 dB seems smaller than that at 1000 dB. The third is that the zonal flow in the reanalysis is too dominant so that some eddies could not be simulated, such as the cyclonic eddy to the east of 160°E between 20°N and 30°N at 2000 dB. In addition, it is noticeable that many floats parking at 1000 dB cannot acquire credible mid-depth velocities due to the time information of their end of ascent （start of descent） on the surface in the trajectory files. Thus, relying on default times of parking, descent and ascent in the metadata files gravely confines their application to measuring mid-depth currents.

关键词： argo floats mid-depth ocean currents reanalysis quantitative comparison mean flow

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Performance analysis of global HYCOM flow field using argo profiles

引用

International Journal of Digital Earth 2023年第1期16卷 3536-3559页

作者： Yixuan Zhang Songshan Yue Kai Xu Zhuo Zhang Liangcheng Zhou Yihan Zhang Guonian Lü School of Geography Key Laboratory of Virtual Geographic Environment(Ministry of Education of PRC)Nanjing Normal UniversityNanjingPeople’s Republic of China State Key Laboratory Cultivation Base of Geographical Environment Evolution(Jiangsu Province) NanjingPeople’s Republic of China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application NanjingPeople’s Republic of China

Flow field data generated by ocean models are important for simulating ocean currents and circulation patterns,which are essential components in digital Earth *** evaluate the accuracy of model-simulatedflow felds,Array for Real-timeGeostrophic Oceanography(argo)float observations can be considered *** this study,a novel method for comparing argo profiles with 3-dimensional trajectories obtained by simulating argo floats in Hybrid Coordinate Ocean Model(HYCOM)-provided flow fields was *** and subsurface trajectories were calculated,and their spatial matching characteristics were *** results demonstrated that(1)the HYCOM surface and subsurface flow felds generally conform to the basic characteristics and trends of ocean currents;(2)the HYCOM sea surface current field error pattern exhibits a symmetrical distribution centered on the equator in the Northern and Southern Hemispheres and increases with increasing latitude;and(3)the HYCOM subsurface flow field exhibits regional differences,with the largest differences in the Gulf Stream,North Atlantic Warm Current,and Westerly Wind Drift *** analysis of the disparities between HYCOM and argo data,the effectiveness of using model simulation data can be enhanced,and the accuracy and dependability of ocean models can be improved.

关键词： HYCoOM argo floats ocean flow field trajectory matching ocean modeling

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mesoscale structure of the central South China Sea detected by SCSMEX Buoy and argo float

引用

Chinese Journal of Oceanology and Limnology 2010年第5期28卷 1102-1111页

作者：曾丽丽王东晓杜岩施平 Key Laboratory of Tropical Marine Environmental Dynamics South China Sea Institute of OceanologyChinese Academy of Sciences Yantai Institute of Coastal Zone Research Chinese Academy of Sciences

We addressed the mesoscale structure variation of the central South China Sea （SCS） with the measurements by a long-lived argo float and a high-resolution ATLAS buoy during 1998-2002. T-S diagram indicates cooling and freshening events in 2000 and 2001 with lower salinity （0.5-0.8） and lower temperature （1-1.7℃）. Significant decrease in the net heat flux and increase in the precipitation suggest that the cooling and freshening is due to extra forcing by the atmosphere. Additional to large year-to-year changes, intraseasonal variability is moderate in the research area. The axis of the maximum intraseasonal temperature and salinity signals are mainly located on the thermocline, Typically, amplitude and period of intraseasonal temperature is about 2℃ and 40-60 days, and that of salinity is 0.34）.5 and 35-60 days. Rapidly-changing winds, heat flux, and precipitation are critical in controlling the intraseasonal fluctuations of the mixed layer of the area. Studies on heat and freshwater balance in the mixed-layer further suggest that horizontal advection plays an important role in intraseasonal fluctuation in the upper ocean. In addition, the energetic mesoscale propagation radiated from the east boundary is linked to the intraseasonal variability in winter.

关键词： South China Sea (SCS) upper ocean water mass argo floats SCSMEX buoy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The South Pacific Subtropical Mode Water in the Tasman Sea

引用

Journal of Ocean University of China 2007年第2期6卷 107-116页

作者： HU Haibo LILT Qinyu LIN Xiaopei LIU Wei Physical Oceanography Laboratory ＆ Ocean-Atmosphere Interaction and Climate Laboratory Ocean University of China Qingdao 266003 P. R. China Center for Climatic Research University of Wisconsin-Madison Madison WisconsinUSA

From the synopical CTD sections in the WOCE PR11 repeated cruises, the South Pacific Subtropical Mode Water (SPSTMW) has been identified in the region of the Tasman Front Extension (TFE) around 29?S to the east of Australia. In the depth range of 150-250 m, the SPSTMW appears as a thermostad with vertical temperature gradient lower than 1.6℃(100 m)-1 and a tem- perature range of 16.5-19.5℃ and as a pycnostad with PV lower than 2×10-10 m-1 s-1 and a potential density range of 25.4-26.0 kg m-3. Like the subtropical mode waters in the North Atlantic and North Pacific, the formation of the SPSTMW is associated with the convective mixing during the austral wintertime as manifested from the time series of the argo floats. And cold water entrains into the mixed layer with the deepening mixed layer from September to the middle of October. During the wintertime formation process, mesoscale eddies prevailing in the TFE region play an important role in the SPSTMW formation, and have a great effect on the SPSTMW distribution in the next year. The deeper (shallower) mixed layer in wintertime, consistent with the depressed (uplifted) permanent thermocline, is formed by the anticyclonic (cyclonic) eddies, and the substantial mode water thicker than 50 m is mainly found in the region of the anticyclonic eddies where the permanent thermocline is deeper than 450 m.

关键词： SPSTMW PR11 repeated cruises argo floats eddy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Dataset of Global Ocean Surface Currents for 1999-2007 Derived from argo Float Trajectories: A Comparison with Surface Drifter and TAO Measurements

引用

Atmospheric and Oceanic Science Letters 2009年第2期2卷 97-102页

作者： XIE Jiping ZHU Jiang ICCES Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China LAPC Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

A dataset of surface current vectors with error estimate from 1999 to 2007 is derived from the trajectories of the Array for Real-time Geostrophic Oceanography (argo) drifting on surface over the global ocean. The error of the estimated surface currents is about 4.7 cm s-1 which is equivalent to the accuracy of the currents determined from the surface drifters. Geographically, the argo-derived surface currents can fill many gaps left by the Global Drifter Program due to the greater number of floats, and can provide a complementary in situ observational system for monitoring global ocean surface currents. The surface currents from the argo floats are compared with the surface drifter-derived currents and the Tropical Atmosphere Ocean program (TAO) measurements. The comparisons show good agreement for both the current amplitude and the direction of surface currents. Results indicate the feasibility of obtaining ocean surface currents from the argo array and of combining the surface currents from argo and the ocean surface drifters for in situ mapping of the global surface currents. The authors also make the dataset available to users of interest for many types of applications.

关键词： surface currents argo floats the Tropical Atmosphere Ocean program surface drifter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：