Modeling study of the impact of tropical seaway changes on East Asian climate

doi:10.13745/j.esf.sf.2021.9.58

Abstract

Abstract:

The closure or constriction of tropical seaways during the early to mid-Pliocene (4.2-3 Ma) are highly relevant to paleoclimate due to their roles in modulating the global heat and moisture transport; however, their potential impacts on the East Asian (EA) climate and the underlying mechanism are unclear. Here, based on a set of sensitivity experiments using the NorESM-L AOGCM model, we systematically analyzed the influence of the Indonesian throughflow constriction and shallow central American seaway (CAS) closure on the EA climate. Our results reveal that the closure of tropical seaways leads to ocean surface warming in tropical regions and cooling in the mid-to-high-latitude North Pacific. The resulting sea surface temperature changes produce contrasting thermal effects in the northern (cooling) and southern China (warming), which leads to more precipitation along the mid-to-east elongated region of East Asia in summer, but causes warmer, drier condition in China in winter. This climate effect mainly results from the constriction of the Indonesian throughflow, with minimal impact from the shallow CAS closure. Combined with qualitative model-data comparison, our results further reveal that the closure/constriction of shallow tropical seaways can act to some extent on the EA climate transition during the Early to Mid-Pliocene but is not the major driver for this transition.

Key words: Pliocene, tropical seaways, East Asian climate, Pacific surface temperature

CLC Number:

P467

TAN Ning, ZHANG Zhongshi, GUO Zhengtang, WANG Huijun. Modeling study of the impact of tropical seaway changes on East Asian climate[J]. Earth Science Frontiers, 2022, 29(5): 310-321.

Figures/Tables 11

References 59

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试验名	边界条件	印尼海道	巴拿马海道	试验时长	气候场
Plio2	上新世暖期	现代	关闭	1 600年	最后100年
IndoCAS100	上新世暖期	打开(深度100 m)	打开(深度100 m)	1 600年	最后100年
IndoCAS100_half	上新世暖期	打开(宽度减少50%,深度100 m)	打开(宽度减少50%,深度100 m)	1 600年	最后100年
Indo100	上新世暖期	打开(深度100 m)	关闭	1 600年	最后100年
CAS100	上新世暖期	现代	打开(深度100 m)	1 600年	最后100年

试验名	边界条件	印尼海道	巴拿马海道	试验时长	气候场
Plio2	上新世暖期	现代	关闭	1 600年	最后100年
IndoCAS100	上新世暖期	打开(深度100 m)	打开(深度100 m)	1 600年	最后100年
IndoCAS100_half	上新世暖期	打开(宽度减少50%,深度100 m)	打开(宽度减少50%,深度100 m)	1 600年	最后100年
Indo100	上新世暖期	打开(深度100 m)	关闭	1 600年	最后100年
CAS100	上新世暖期	现代	打开(深度100 m)	1 600年	最后100年

序号	剖面/钻孔	经纬度/(°)	文献	指标	指示意义
1	ODP1146	19.27/116.16	[49]	Rb/Sr,CIA,平均粒度	4~3 Ma夏季降水加强,冬季风加强
2	长江三角洲LZK1	31.2/121.5	[50]	CIA	4~3 Ma夏季降水加强
3	日本西南部	34.45/136.3	[51]	化学风化数据	4~3 Ma夏季降水加强
4	西和	34.04/105.23	[34]	黄土粒度,化学风化数据	3.6 Ma后冬季风加强,夏季风减弱
5	蓝田	34/109	[52]	古土壤δ¹³C	3.6 Ma后呈变干趋势
6	西峰	35.53/107.58	[53]	孢粉	4.5~3.7 Ma气候变干
	西峰	35.53/107.58	[34]	黄土粒度,化学风化数据	3.6 Ma后冬季风加强,夏季风减弱
	西峰	35.53/107.58	[35]	黄土粒度	3.6 Ma后冬季风加强
7	灵台	35.04/107.39	[54]	古土壤δ¹³C	4 Ma后呈变干趋势
7	灵台	35.04/107.39	[55]	黄土粒度	4.7~4.3 Ma冬季风加强
8	朝那	35.6/107.12	[56]	生物标志物	3.8 Ma后夏季风、冬季风均加强
9	宝德	39/111	[52]	古土壤δ¹³C	3.6 Ma后呈变干趋势
10	酒西	39.47/97.32	[57]	孢粉	3.6~3.3 Ma后呈变干趋势
11	鸭湖	37.4/94.3	[58]	孢粉	3.6 Ma后呈变干趋势
12	白家嘴	35.53/107.27	[36]	粉尘累积率	3.6 Ma后冬季风加强
13	佳县	38.16/110.5	[59]	黄土粒度	3.6 Ma后冬季风加强
14	ODP885/886	44.7/-168.3	[45]	粉尘累积率	3.6 Ma后内陆干旱化加剧,西风急流加强

序号	剖面/钻孔	经纬度/(°)	文献	指标	指示意义
1	ODP1146	19.27/116.16	[49]	Rb/Sr,CIA,平均粒度	4~3 Ma夏季降水加强,冬季风加强
2	长江三角洲LZK1	31.2/121.5	[50]	CIA	4~3 Ma夏季降水加强
3	日本西南部	34.45/136.3	[51]	化学风化数据	4~3 Ma夏季降水加强
4	西和	34.04/105.23	[34]	黄土粒度,化学风化数据	3.6 Ma后冬季风加强,夏季风减弱
5	蓝田	34/109	[52]	古土壤δ¹³C	3.6 Ma后呈变干趋势
6	西峰	35.53/107.58	[53]	孢粉	4.5~3.7 Ma气候变干
	西峰	35.53/107.58	[34]	黄土粒度,化学风化数据	3.6 Ma后冬季风加强,夏季风减弱
	西峰	35.53/107.58	[35]	黄土粒度	3.6 Ma后冬季风加强
7	灵台	35.04/107.39	[54]	古土壤δ¹³C	4 Ma后呈变干趋势
7	灵台	35.04/107.39	[55]	黄土粒度	4.7~4.3 Ma冬季风加强
8	朝那	35.6/107.12	[56]	生物标志物	3.8 Ma后夏季风、冬季风均加强
9	宝德	39/111	[52]	古土壤δ¹³C	3.6 Ma后呈变干趋势
10	酒西	39.47/97.32	[57]	孢粉	3.6~3.3 Ma后呈变干趋势
11	鸭湖	37.4/94.3	[58]	孢粉	3.6 Ma后呈变干趋势
12	白家嘴	35.53/107.27	[36]	粉尘累积率	3.6 Ma后冬季风加强
13	佳县	38.16/110.5	[59]	黄土粒度	3.6 Ma后冬季风加强
14	ODP885/886	44.7/-168.3	[45]	粉尘累积率	3.6 Ma后内陆干旱化加剧,西风急流加强