The research of global sea level change of the last 10 years has been comprehensively reviewed and the main results of it have been obtained:(1) the global sea level rising ratios was around 2.5 mm/a to 3.84 mm/a,and the main contribution is from the thermal expansion of sea water;(2) there were some space differences for sea level rise,and the value in the West Pacific Ocean and the East Indian Ocean was especially more 10 times higher than the global average;(3) the seasonal fluctuation of sea level was obvious in areas of the Pacific Ocean and the Atlantic Ocean with north latitude 30-40 degree.When the season of the highest sea level was compared with the term of the typhoon and hurricane occurring annually,it could be found that there were global dangerous seacoasts,which were vulnerable by sea level rise,located in the regions of the Northwest Pacific Ocean and the North Atlantic Ocean with north latitude 20-50 degree during the seasons of Typhoon in August and October.The region includes coast areas as Chinese Mainland East Seacoast,Japanese Seacoast,American East Seacoast,Mexico Bay Seacoast and Caribbean Seacoast.
Zhong, W., Ma, Q. H., Xue, J. B., Zheng, Y. M., Cai, Y. & Ou, Y. J. 2009: Humification degrees of a lacustrine sedimentary sequence as an indicator of past climatic changes in the last c . 49 000 years in South China. Boreas , 10.1111/j.1502‐3885.2009.00119.x. ISSN 0300‐9483. An 860 cm long sediment core recovered from Dahu Swamp was used to test the potential of the degree of humification (expressed as the corrected absorbance values, HD cab ) of lacustrine sediments as an indicator of past climatic changes in South China. The chronological sequence of this core was established using 10 AMS 14 C dates and 10 conventional 14 C dates and gives the bottom age of c . 48 800 cal. yr BP. Based on comparisons with multiproxy records, such as lithological variation, organic carbon isotope ratio, organic matter content and dry bulk density, we infer that the HD cab record is sensitive to local hydrological variations that are closely related to the East Asian (EA) summer monsoon precipitation. Higher HD cab values would indicate relatively drier conditions, suggesting a weakening of the EA summer monsoon and vice versa. Based on the HD cab , as well as other multiproxies, the climatic history in the last c . 49 000 years in the swamp area shows agreement with the Chinese stalagmite record and with the 25°N summer solar insolation, implying that orbitally induced insolation may have played a role in the last glacial period (LGP) climate in South China. Several millennial‐scale dry phases during the LGP show similarities with the stadials revealed by the ice core record in Greenland and from the Chinese cave stalagmites. Our study demonstrates that the HD cab of lacustrine sediments is a useful proxy of past climatic changes in South China.
On the basis of previous studies and our investigations of vermicular red soil on the spot, the vermicular red soil is preliminarily discussed by analyzing several typical stratigraphic sections from published articles and their related data including grain-size compositions, chemical components, X-ray diffractions and the vermicular red soil's shapes. From the above related analyses, it is believed that the vermicular red soil is not formed under the warm and wet surrounding all the time, it may go through some fluctuating periods of relatively cold-wet or cool-dry circumstances.
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