地理学报 ›› 2015, Vol. 70 ›› Issue (9): 1477.doi: 10.11821/dlxb201509010
张威, 潘少明, 张克新, 曹立国, 赵捷
收稿日期:
2015-06-12
修回日期:
2015-07-19
出版日期:
2015-09-20
发布日期:
2015-09-20
作者简介:
作者简介:张威(1993-), 男, 主要研究方向为地球化学和气候变化。E-mail: tianxinzw@outlook.com
基金资助:
Wei ZHANG, Shaoming PAN, Kexin ZHANG, Liguo CAO, Jie ZHAO
Received:
2015-06-12
Revised:
2015-07-19
Published:
2015-09-20
Online:
2015-09-20
摘要:
土壤侵蚀是关系人类生存与可持续发展的重大环境问题。20世纪60年代以来,Cs-137作为一种人工放射性示踪核素,被广泛应用于土壤侵蚀及堆积研究。而准确估算区域Cs-137背景值(Cs-137 Reference Inventory, CRI)是应用Cs-137开展土壤侵蚀研究的前提条件,其结果直接影响土壤侵蚀速率结果的准确性和可靠性。基于现有文献资料中获取的中国大陆102个CRI实测数据,以及全球降水气候中心提供的降水量再分析资料(空间分辨率2.5°×2.5°、0.5°×0.5°,1981-2010年),在借鉴Walling & He模型(Walling & He Model, WHM)和Michio Aoyama模型(Michio Aoyama Model, MAM)的基础上,本文建立了中国大陆CRI修正模型(Modified CRI Model for the Mainland of China, MCM),并利用Kriging/Cokriging插值方法计算了中国大陆CRI的空间分布。模型评估与对比分析表明,MCM模拟值与实测值大致吻合,且总体高于WHM和MAM模拟值,MCM能对中国大陆CRI进行较高分辨率、较高精度的模拟。模拟结果显示,中国大陆CRI的范围为141~12123 Bq/m2,在东北及新疆局部地区达到最大值,最小值主要集中于25°N以南地带。除新疆局部地区外,中国大陆CRI分布整体呈现自西向东,同纬度地区随降水量增加而增加的特点,而纬向上主要呈现随纬度增加而增加的特点。此外,大尺度大气流场、再悬浮过程、局部核试验等因素增加了中国大陆CRI分布的不均匀性。
张威, 潘少明, 张克新, 曹立国, 赵捷. 中国大陆Cs-137背景值研究[J]. 地理学报, 2015, 70(9): 1477.
Wei ZHANG, Shaoming PAN, Kexin ZHANG, Liguo CAO, Jie ZHAO. Study of the Cesium-137 Reference Inventory in the Mainland of China[J]. Acta Geographica Sinica, 2015, 70(9): 1477-.
表2
中国大陆七大区域CRI变化
分区 | 区域名称 | MCM范围(Bq/m2) | WHM范围(Bq/m2) | MAM范围(Bq/m2) |
---|---|---|---|---|
I | 西北地区 | 214~12123 | 275~1321 | 1695~5240 |
II | 华北地区 | 727~3035 | 629~1821 | 1830~5799 |
III | 东北地区 | 1665~4096 | 1066~2246 | 3455~7120 |
IV | 西南地区 | 141~5663 | 421~1066 | 1314~5601 |
V | 华中地区 | 1292~2119 | 697~1096 | 1112~3563 |
VI | 华东地区 | 875~2382 | 712~1210 | 1081~4115 |
VII | 华南地区 | 231~1721 | 562~782 | 1152~1881 |
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