地理学报 ›› 2015, Vol. 70 ›› Issue (1): 97-109.doi: 10.11821/dlxb201501008
刘小康(), 饶志国(
), 张肖剑, 黄伟, 陈建徽, 陈发虎
收稿日期:
2014-09-12
修回日期:
2014-11-11
出版日期:
2015-01-20
发布日期:
2015-01-20
作者简介:
作者简介:刘小康(1990-), 男, 甘肃天水人, 博士研究生, 主要从事地球化学与过去气候变化研究。E-mail:
基金资助:
Xiaokang LIU(), Zhiguo RAO(
), Xiaojian ZHANG, Wei HUANG, Jianhui CHEN, Fahu CHEN
Received:
2014-09-12
Revised:
2014-11-11
Published:
2015-01-20
Online:
2015-01-20
Supported by:
摘要:
利用全球降水同位素观测网(GNIP)提供的乌鲁木齐大气降水氧同位素(δ18Op)观测数据(1986-2003年),结合和田δ18Op数据及天山冰芯δ18O记录,分析了天山地区δ18Op在年内和年际尺度上的变化特征,及其与主要气候要素(温度和降水量)的关系。结果表明,年内尺度上,δ18Op与月均温和月降水量均为显著正相关,表现出明显的“温度效应”;年际尺度上,加权平均年δ18Op与年均温度却呈现负相关关系,与降水量仍为正相关。近40~50年的天山地区4支冰芯的δ18O具有整体偏负的变化趋势,与研究区逐步升高的温度呈反向变化,说明在年际至年代际尺度上,这一区域δ18Op与温度之间的负相关关系是客观存在的。进一步对研究区水汽来源路径的对比分析发现:δ18Op值偏负的高温年份(1997年)的暖季水汽相对更多来源于远源的高纬度区域,而δ18Op值偏正的低温年份(1988年)则相对更多来自近源的中、低纬度区域;同时,研究区上风方向的欧亚大陆14个GNIP站点1997年和1988年的暖季加权平均δ18Op值存在高纬度区域偏负而中、低纬度区域偏正的特征;这些结果说明年际至年代际尺度上,天山地区δ18Op与温度之间的负相关,本质上指示了西风环流南北摆动所引起的水汽来源变化,可以作为西风环流变化的指示器。
刘小康, 饶志国, 张肖剑, 黄伟, 陈建徽, 陈发虎. 天山地区大气降水氧同位素的影响因素及其对西风环流变化的指示意义[J]. 地理学报, 2015, 70(1): 97-109.
Xiaokang LIU, Zhiguo RAO, Xiaojian ZHANG, Wei HUANG, Jianhui CHEN, Fahu CHEN. Variations in the oxygen isotopic composition of precipitation in the Tianshan Mountains region and their significance for the Westerly circulation[J]. Acta Geographica Sinica, 2015, 70(1): 97-109.
表1
欧亚大陆14个GNIP站点的位置信息和相应的加权平均暖季δ18Op值(5-9月)
站点编号 | 站点名称 | 所处国家 | 纬度(°N) | 经度(°E) | 观测年份 | 1997年加权平均暖季δ18Op (‰, VSMOW) | 有同位素数据月份 | 1988年加权平均暖季δ18Op (‰, VSMOW) | 有同位素数据月份 |
---|---|---|---|---|---|---|---|---|---|
1713000 | 安卡拉 | 土耳其 | 39.95 | 32.88 | 1963-2009 | -5.78 | 5-8月 | -5.88 | 5-8月 |
2221700 | 坎达拉克沙湾 | 俄罗斯 | 67.15 | 32.35 | 1996-2000 | -12.10 | 5-9月 | - | - |
2606300 | 圣彼得堡 | 俄罗斯 | 59.97 | 30.30 | 1980-1990 | - | - | -10.70 | 5-9月 |
2642200 | 里加 | 拉脱维亚 | 56.97 | 24.07 | 1969-1989 | - | - | -6.35 | 5-9月 |
2719600 | 基洛夫 | 俄罗斯 | 58.65 | 49.62 | 1980-2000 | -9.53 | 5-9月 | - | - |
2740200 | 卡里宁 | 俄罗斯 | 56.90 | 35.90 | 1980-1989 | - | - | -7.61 | 5-9月 |
2822500 | 彼尔姆 | 俄罗斯 | 58.01 | 56.18 | 1973-1990 | - | - | -9.17 | 5-7月 |
2961200 | 巴拉宾斯克 | 俄罗斯 | 55.33 | 78.37 | 1996-2000 | -8.90 | 5-7,9月 | - | - |
3400900 | 库尔斯克 | 俄罗斯 | 51.73 | 36.27 | 1996-2000 | -9.75 | 7-9月 | - | - |
3488000 | 阿斯特拉罕 | 俄罗斯 | 46.25 | 48.03 | 1980-2000 | -5.06 | 5-7,9月 | -4.99 | 5-9月 |
3748400 | 巴统 | 格鲁吉亚 | 41.65 | 41.63 | 1980-1990 | - | - | -5.20 | 8-9月 |
4094900 | 喀布尔 | 阿富汗 | 34.57 | 69.21 | 1962-1991 | - | - | 0.07 | 5, 6, 8月 |
5182800 | 和田 | 中国 | 37.13 | 79.93 | 1988-1992 | - | - | -3.04 | 5-9月 |
5182801 | 乌鲁木齐 | 中国 | 43.78 | 87.62 | 1986-2003 | -8.64 | 5-8月 | -6.39 | 5-9月 |
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