利用ICESat/GLAS数据获取北极海冰出水高度的研究     

陈国栋  李建成  黄甜 《大地测量与地球动力学》2017,37(12):1291-1296

利用ICESat激光测高卫星数据获取2003-10～2008-03北冰洋秋季与冬季海冰出水高度,结果与国外相关研究基本一致。出水高度数据的拟合结果表明,北极海冰出水高度以每年约2.3 cm的速度递减,该速度比此前的相关研究结果更快。在不同作者利用ICESat数据计算的北极海冰出水高度的对比中,不同方法得到的结果之间存在明显的系统误差。对引起系统误差的原因进行深入分析表明,高程滤波的窗口长度、确定海面高的范围以及海面观测值的选取方式都会使出水高度的计算产生cm级的误差。  相似文献   

Constraining Holocene sea levels using U‐Th ages of phreatic overgrowths on speleothems from coastal caves in Mallorca (Western Mediterranean)     

Paola Tuccimei  Michele Soligo  Joaquin Ginés  Angel Ginés  Joan Fornós  Jan Kramers  Igor Maria Villa 《地球表面变化过程与地形》2010,35(7):782-790

Phreatic overgrowths on speleothems (POS) are carbonate formations deposited at the water table of caves in unique karstic coastal settings having morphologies that can be directly related to sea level at the time of formation. The U‐Th ages of calcite and aragonite overgrowths collected from the modern water table in coastal caves on Mallorca (Cova de Cala Varques A and Cova des Pas de Vallgornera) were determined using high‐precision MC‐ICPMS techniques. U‐Th ages indicate that phreatic carbonate deposition occurred between ca 2·8 and at least 0·6 ka BP and are in accord with an archeologically estimated age of 3·7–3·0 ka BP for a drowned prehistoric construction at a depth of 1 m below current sea level in a cave from the same area. Speleothem δ¹³C and δ¹⁸O and chemical composition of cave pools provide supportive evidence that POS reflect mixing between seawater and brackish water table. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Spatial and temporal variability of sediment accumulation rates on two tidal flats in Lister Dyb tidal basin,Wadden Sea,Denmark   总被引：1，自引：0，他引：1  

Anni T. Madsen  Andrew S. Murray  Thorbjørn J. Andersen  Morten Pejrup 《地球表面变化过程与地形》2010,35(13):1556-1572

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The history of water salinity in the Pearl River estuary,China, during the Late Quaternary   总被引：1，自引：0，他引：1  

Yongqiang Zong  Fengling Yu  Guangqing Huang  Jeremy M. Lloyd  Wyss W.‐S. Yim 《地球表面变化过程与地形》2010,35(10):1221-1233

This research reconstructed the Late Quaternary salinity history of the Pearl River estuary, China, from diatom records of four sedimentary cores. The reconstruction was produced through the application of a diatom–salinity transfer function developed based on 77 modern surface sediment samples collected across the estuary from shallow marine environment to deltaic distributaries. The statistical analysis indicates that the majority of sediment samples from the cores has good modern analogues, thus the reconstructions are reliable. The reconstructed salinity history shows the older estuarine sequence formed during the last interglacial was deposited under similar salinity conditions to the younger estuarine sequence, which was formed during the present interglacial. Further analysis into the younger estuarine sequence reveals the interplays between sea level, monsoon‐driven freshwater discharge, and deltaic shoreline movement, key factors that have influenced water salinity in the estuary. In particular, a core from the delta plain shows the effects of sea‐level change and deltaic progradation, while cores from the mouth region of the estuary reveal changes of monsoon‐driven freshwater discharge. This study demonstrates the advantages of quantitative salinity reconstructions to improve the quality of reconstruction and allow direct comparison with other quantitative records and the instrumentally observed values of salinity. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

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翟振和  孙中苗 《大地测量与地球动力学》2010,30(2):137-140

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Relationship between North Pacific SST anomalies and the atmospheric circulation anomalies in January 2008     

Jianbo Wang  Lei Fan  Qinyu Liu 《中国海洋大学学报(英文版)》2010,9(1):11-15

Based on the NCEP (National Centers for Environmental Prediction) data, the relationship between the Sea Surface Temperature Anomalies (SSTAs) in the North Pacific and the atmospheric circulation anomalies in January 2008 is analyzed in this study. The SSTA mode most correlated with the Geopotential Height anomalies (GHAs) in January 2008 in the North Pacific exhibited a basin-wide horseshoe pattern with a warm center in November 2007. This persistent SSTA pattern would induce positive GHAs in the Aleutian Low area and East Asia and the northward extension of the West Pacific Subtropical High in January 2008 by maximum diabatic heating in the atmosphere over the Kuroshio Oyashio Extension (KOE) area, leading to the occurence of the circumpolar trough-ridge wave train anomaly in January 2008.  相似文献   

海面-地面系统中三维古地面反演计算的剥蚀算法研究   总被引：2，自引：0，他引：2  

王琳  钟鹤翔  谢志仁 《地理与地理信息科学》2010,26(2)

三维古地面反演计算是海面-地面系统研究中的一个基础研究。该文在前人研究的基础上提出了三维古地面反演计算的剥蚀算法,并与传统的加积算法做了比较分析,得出剥蚀算法比加积算法有对时间序列离散判断简单、方便计算等优点。同时,在GIS平台下实现了该算法,并以长江三角洲地区为试验区,进行了古地面虚拟反演计算,取得了较好的效果。  相似文献   

Characterization of error dynamics in a 3D coastal model of the Catalan sea using stochastic modelling     

Gabriel Jordà  Pierre De Mey 《Continental Shelf Research》2010

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Recent warming in the Yellow/East China Sea during winter and the associated atmospheric circulation   总被引：1，自引：0，他引：1  

Sang-Wook Yeh  Cheol-Ho Kim 《Continental Shelf Research》2010

We examine characteristics in the variability of sea surface temperature (SST) in the Yellow/East China Sea during the boreal winter (December–January–February) for the period 1950–2008 in observations. It is found that the mean SST in the Yellow Sea/East China Sea gradually increases during recent decades. A warming trend of a basin scale SST is significant in most of the regions in the Yellow/East Sea, which is well explained by the variability of the first empirical orthogonal function SST mode. We suggest one candidate mechanism that the North Pacific oscillation (NPO)-like sea level pressure play an important role to warm the Yellow/East China Sea. Anomalous anticyclonic circulation, which is the southern lobe of NPO-like sea level pressure over the North Pacific, causes a weakening of northerly mean winds over the Yellow/East China Sea during winter. This contributes to increase in the SST in the Yellow/East China Sea through the changes in the latent heat and sensible heat fluxes.  相似文献   

Inter-annual and seasonal variations in the air–sea CO₂ balance in the central Baltic Sea and the Kattegat     

Karin Wesslander  Anders Omstedt  Bernd Schneider 《Continental Shelf Research》2010

We estimated the net annual air–sea exchange of carbon dioxide (CO₂) using monitoring data from the East Gotland Sea, Bornholm Sea, and Kattegat for the 1993–2009 period. Wind speed and the sea surface partial pressure of CO₂ (pCO₂^w), calculated from pH, total alkalinity, temperature, and salinity, were used for the flux calculations. We demonstrate that regions in the central Baltic Sea and the Kattegat alternate between being sinks (−) and sources (+) of CO₂ within the −4.2 to +5.2 mol m⁻² yr⁻¹ range. On average, for the 1994–2008 period, the East Gotland Sea was a source of CO₂ (1.64 mol m⁻² yr⁻¹), the Bornholm Sea was a source (2.34 mol m⁻² yr⁻¹), and the Kattegat was a sink (−1.16 mol m⁻² yr⁻¹). Large inter-annual and regional variations in the air–sea balance were observed. We used two parameterizations for the gas transfer velocity (k) and the choice varied the air–sea exchange by a factor of two. Inter-annual variations in pCO₂^w between summers were controlled by the maximum concentration of phosphate in winter. Inter-annual variations in the CO₂ flux and gas transfer velocity were larger between winters than between summers. This indicates that the inter-annual variability in the total flux was controlled by winter conditions. The large differences between the central Baltic Sea and Kattegat were considered to depend partly on the differences in the mixed layer depth.  相似文献