基于Icepack海冰柱模式的融池反照率模拟研究

曹淑涛; 苏洁; 李涛; 钟文理; 王晓宇; 牟龙江

doi:10.12284/hyxb2021101

基于Icepack海冰柱模式的融池反照率模拟研究

doi: 10.12284/hyxb2021101

曹淑涛^{1, 2,},
苏洁^{1, 2, 3, ,},
李涛^{1, 2},
钟文理³,
王晓宇³,
牟龙江⁴

1.
中国海洋大学海洋与大气学院，山东青岛 266100
2.
中国高校极地联合研究中心，北京 100875
3.
中国海洋大学物理海洋教育部重点实验室，山东青岛 266100
4.
青岛海洋科学与技术国家实验室发展中心，山东青岛 266100

基金项目: 国家重点研发计划项目(2018YFA0605901)；国家自然科学重点基金(41941012)；国家自然科学基金面上基金(42076228)

详细信息

作者简介:
曹淑涛（1996—），男，山东省新泰市人，主要从事北极海冰热力学过程参数化研究。E-mail：cst@stu.ouc.edu.cn

通讯作者:
苏洁，教授，主要从事北极海冰热力学研究。E-mail：sujie@ouc.edu.cn

中图分类号: P731.15
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- 文章访问数: 220
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-11
- 修回日期: 2021-05-14
- 网络出版日期: 2021-06-16
- 刊出日期: 2021-07-25

Study on melt pond albedo based on Icepack sea ice column model

Cao Shutao^{1, 2
,},
Su Jie^{1, 2, 3
, ,},
Li Tao^{1, 2},
Zhong Wenli³,
Wang Xiaoyu³,
Mu Longjiang⁴

1.
College of Oceanic and Atmospheric Science, Ocean University of China, Qingdao 266100, China
2.
University Corporation for Polar Research, Beijing 100875, China
3.
Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China
4.
National Laboratory Development Center for Marine Science and Technology, Qingdao 266100, China

摘要

摘要: 基于Icepack一维海冰柱模式，以2014年中国第6次北极科学考察长期冰站ICE06的3个融池的辐射参量和气象参量的连续观测作为大气强迫数据，对融池反照率及相关参量进行了模拟。本文引入观测的融池深度及海冰厚度作为初始条件，通过考虑融池覆盖率的作用，改进了平整冰融池参数化方案中海冰干舷的计算，修正了冰上可允许的最大融池深度，成功实现了对融池参数变化的模拟；同时，还修正了入射辐射分量比例系数与对应反照率分量权重系数不一致的问题。标准试验中，模拟的3个融池的反照率与观测结果之间的平均误差分别为0.01、0.05和0.13；入射辐射比例的敏感性试验结果表明，当可见光辐射比例增大8%时，融池反照率的模拟结果增大了6%～8%；融池表面再冻结试验的结果显示，当再冻结冰层厚度小于2 cm时，模拟冰面反照率的增加不足0.006，由此引起的表面能量收支减少了约1.1 W/m²。本文研究指出，准确的入射辐射比例对于改善北极海冰反照率模拟是必要的；并指出目前模式仍存在融池表面再冻结参数化、热收支计算、表面吹雪效应等有待解决的问题。
- 融池 /
- 反照率 /
- 融池深度 /
- Icepack海冰模式 /
- 模拟
Abstract: Based on one-dimensional sea ice column model Icepack, albedo and depth of melt pond were simulated. Atmospheric forcing data were collected from ICE06, a long-term ice station established during the Sixth Chinese National Arctic Research Expedition in 2014 in which the radiation and meteorological parameters of three melt ponds were continuously observed. In this paper, observed melt pond depth and thickness of sea ice under ponds were used as initial conditions. Furthermore, the calculation of sea ice freeboard in the melt pond scheme of level ice was improved by considering the effect of melt pond fraction. Consequently, by improving the formula of the maximum depth of melt pond above sea ice, simulation of melt pond albedo as well as other related parameters were successfully realized. Additionally, the inconsistency between the proportion coefficient of the incident solar radiation component and the weight coefficient of the corresponding albedo component was modified. The average errors between the simulated and observed albedo of the three ponds in the standard experiments were 0.01, 0.05 and 0.13, respectively. The sensitivity experiment results for the incident radiation proportion suggested that when the proportion of visible radiation increased by 8%, the simulation results of the melt pond albedo increased by 6%−8%. Results of the melt pond refreezing experiments suggested that when the thickness of lid ice is less than 0.02 m, the increase of simulated ice albedo is less than 0.006, resulting in a decrease of surface energy budget by about 1.1 W/m². It is pointed out that providing an accurate proportion of incident radiation is necessary to improve the simulation of Arctic sea ice albedo. Furthermore, there are still some physical processes which need to be improved in Icepack/CICE model such as melt pond surface refreezing schemes, surface heat budget calculation, surface snow blowing effect and so on.
- melt pond /
- albedo /
- melt pond depth /
- Icepack sea ice model /
- simulation

HTML全文

图 1 第6次中国北极科学考察期间建立的冰站位置及2014年8月23日海冰密集度 (a)、ICE06上的气象观测站(b)和融池辐射通量观测(c)

Fig. 1 Locations of ice stations established during the Sixth Chinese National Arctic Research Expedition along with the sea ice concentration on August 23, 2014 (a), meteorological station (b) and melt pond radiation flux observation (c) of ICE06

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图 2 观测期间融池周围的气象参量

Fig. 2 Meteorological parameters around melt ponds during observation

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图 3 观测期间融池表面的长波辐射通量

Fig. 3 Surface longwave radiation flux of melt ponds during observation

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图 4 观测期间融池表面的短波辐射通量(a1–a3)、基于观测的下行和上行短波辐射通量计算的反照率(b1–b3)和太阳高度角(c1–c3)，其中太阳高度角由Icepack模式计算

Fig. 4 Surface shortwave radiation flux (a1–a3), albedo calculated using the observed downward and upward shortwave fluxes (b1–b3) and solar elevation angle (c1–c3) of melt ponds during observation, in which the solar elevation angle is calculated by Icepack

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图 5 Icepack对融池宽带反照率的模拟及其与观测结果的比较

a.每小时平均的融池反照率；b. 模拟与观测反照率的差值

Fig. 5 Melt pond albedo simulation results of Icepack and comparison with observation

a. The hourly averaged pond albedo; b. the difference between simulated and observed albedo

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图 6 Icepack对3个融池深度的模拟及两个试验模拟的融池深度差

Fig. 6 Pond depth simulation results of three melt ponds using Icepack and the pond depth difference of the two experiments

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图 7 cesm和hlid融池再冻结参数化方案中，融池表面再冻结海冰厚度(a)、融池深度 (b)、融池反照率(c)、融池覆盖率(d)、网格平均反照率(e)和网格表面热通量(f)的模拟结果

Fig. 7 Simulation results of lid ice thickness (a), melt pond depth (b), melt pond albedo (c), melt pond fraction (d), grid box mean albedo (e), and surface heat flux (f) in the cesm and hlid refrozen schemes

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表 1 第6次中国北极科学考察ICE06长期冰站的融池观测信息

Tab. 1 Melt pond observation information of the long term station ICE06 in the Sixth Chinese National Arctic Research Expedition

观测信息	融池1	融池2	融池3
位置	81.06°N，157.70°W	81.10°N，157.10°W	81.16°N，156.72°W
起止观测时间(UTC)	8月19日21:53至8月20日22:31	8月22日03:08至8月23日21:25	8月23日22:10至8月24日21:09
总观测时长/h	26	43	24
观测频率/s⁻¹	60	10	10
上覆冰厚/cm	6～7	4	4
融池深度/cm	32	30	19
融池底部冰厚/m	1.5	1.5	1.5
天气状况	阴有雾	有雾、期间降雪	有雾、期间降雪
降雪开始时间	\	2014年8月22日03:11	2014年8月23日22:10
降雪持续时间	\	约42 h	约23 h
平均降雪速率/(kg·m⁻²·s⁻¹)	\	6.61×10⁻⁵	1.33×10⁻⁴
降雪结束时融池周围冰面上的新雪厚度/cm	0	5.0	5.5
注：\表示观测期间未降雪。

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表 2 Icepack模式数值试验设置

Tab. 2 Numerical experiments configuration of Icepack model

设置	Exp01（标准试验）	Exp02
可见光与近红外比例	0.78∶0.22（太阳可见）	0.85∶0.15（太阳不可见）
直射与漫射辐射比例	0.10∶0.90（云量较大，漫射辐射为主）
初始冰厚	1.5 m
初始融池深度	取观测值（表1）
初始融池覆盖率	30%
融池参数化方案	基于平整冰的lvl方案
反照率分类	CCSM3反照率类型
反照率参数化方案	Delta-Eddington
热力学参数化方案	糊状层热力学方案

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