Thaw processes in ice-rich permafrost landscapes represented with laterally coupled tiles in a land surface model
Thaw processes in ice-rich permafrost landscapes represented with laterally coupled tiles in a land surface model
复制标题
富含冰的永久冻土景观的解冻过程以地表模型中的横向耦合瓦片表示
DOI：
10.5194/tc-13-591-2019
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Westermann
中科院分区：
文献类型：
--
作者：
K. Aas;L. Martin;Jan Nitzbon;M. Langer;J. Boike;Hanna Lee;T. Berntsen;S. Westermann
抽象的。地球
系统模型（ESM）是我们预测未来气候的主要工具
变化，但它们代表小尺度陆面过程的能力是
目前有限。对于永久冻土景观来说尤其如此，
过量的地面冰融化和随后的沉降影响横向
可以显著改变土壤条件和热通量的过程，
水和碳排放到大气中。在这里，我们动态地展示了
变化的微地形和相关的雪、水和热的横向通量
可以通过适合于实现的平铺方法来表示
大规模的模型，我们调查这些横向过程是
重要的是再现观察到的景观演变。组合现有
表示过量地面冰、雪再分布和横向的方法
水和能量通量在两个耦合瓦片，我们表明，该模型的方法
可以模拟在两个非常不同的永久冻土中观察到的退化过程
的风景.我们能够模拟从低中心到
高中心多边形，当应用于多边形苔原在寒冷，
连续多年冻土区，这导致（i）一个更现实的
通过高架特征的干燥来表示土壤条件，
降低特征的润湿与能量通量的相关变化，（ii）高达
目前平均永久冻土温度降低了2摄氏度
（2000-2009年）气候，（三）未来永久冻土退化延迟
RCP4.5情景下的情况，以及（四）通过
雪和土壤水反馈机制一旦沉降开始。应用于
在零星的永久冻土带的泥炭高原，同样的两瓦系统可以
代表了一个被永久冻土覆盖的泥炭高地，
多年冻土无围栏及其退化，在未来的适度
变暖的情景这些结果表明，
横向通量来真实地模拟当前的永久冻土状态
以及随着气候持续变暖其退化轨迹。
在ESM中实现横向耦合的瓦片可以改善表示
一系列永久冻土过程，这可能会影响模拟的
永冻层碳反馈的幅度和时间。
Abstract. Earth
system models (ESMs) are our primary tool for projecting future climate
change, but their ability to represent small-scale land surface processes is
currently limited. This is especially true for permafrost landscapes in which
melting of excess ground ice and subsequent subsidence affect lateral
processes which can substantially alter soil conditions and fluxes of heat,
water, and carbon to the atmosphere. Here we demonstrate that dynamically
changing microtopography and related lateral fluxes of snow, water, and heat
can be represented through a tiling approach suitable for implementation in
large-scale models, and we investigate which of these lateral processes are
important to reproduce observed landscape evolution. Combining existing
methods for representing excess ground ice, snow redistribution, and lateral
water and energy fluxes in two coupled tiles, we show that the model approach
can simulate observed degradation processes in two very different permafrost
landscapes. We are able to simulate the transition from low-centered to
high-centered polygons, when applied to polygonal tundra in the cold,
continuous permafrost zone, which results in (i) a more realistic
representation of soil conditions through drying of elevated features and
wetting of lowered features with related changes in energy fluxes, (ii) up to
2 ∘C reduced average permafrost temperatures in the current
(2000–2009) climate, (iii) delayed permafrost degradation in the future
RCP4.5 scenario by several decades, and (iv) more rapid degradation through
snow and soil water feedback mechanisms once subsidence starts. Applied to
peat plateaus in the sporadic permafrost zone, the same two-tile system can
represent an elevated peat plateau underlain by permafrost in a surrounding
permafrost-free fen and its degradation in the future following a moderate
warming scenario. These results demonstrate the importance of representing
lateral fluxes to realistically simulate both the current permafrost state
and its degradation trajectories as the climate continues to warm.
Implementing laterally coupled tiles in ESMs could improve the representation
of a range of permafrost processes, which is likely to impact the simulated
magnitude and timing of the permafrost–carbon feedback.
登录
查看更多内容
影响因子：
5.1
作者：
Chunjing Qiu;Dan Zhu;P. Ciais;B. Guenet;G. Krinner;S. Peng;M. Aurela;C. Bernhofer;C. Brümmer;S. Bret-Harte;H. Chu;Jiquan Chen;A. Desai;J. Dušek;E. Euskirchen;K. Fortuniak;L. Flanagan;T. Friborg;M. Grygoruk;S. Gogo;T. Grünwald;B. Hansen;D. Holl;E. Humphreys;M. Hurkuck;G. Kiely;Janina Klatt;L. Kutzbach;C. Largeron;F. Laggoun‐Défarge;M. Lund;P. Lafleur;Xuefei Li;I. Mammarella;L. Merbold;M. Nilsson;J. Olejnik;M. Ottosson‐Löfvenius;W. Oechel;F. Parmentier;M. Peichl;N. Pirk;O. Peltola;W. Pawlak;D. Rasse;J. Rinne;G. Shaver;H. Schmid;M. Sottocornola;R. Steinbrecher;T. Sachs;M. Urbaniak;D. Zona;K. Ziemblińska
通讯作者：
Chunjing Qiu;Dan Zhu;P. Ciais;B. Guenet;G. Krinner;S. Peng;M. Aurela;C. Bernhofer;C. Brümmer;S. Bret-Harte;H. Chu;Jiquan Chen;A. Desai;J. Dušek;E. Euskirchen;K. Fortuniak;L. Flanagan;T. Friborg;M. Grygoruk;S. Gogo;T. Grünwald;B. Hansen;D. Holl;E. Humphreys;M. Hurkuck;G. Kiely;Janina Klatt;L. Kutzbach;C. Largeron;F. Laggoun‐Défarge;M. Lund;P. Lafleur;Xuefei Li;I. Mammarella;L. Merbold;M. Nilsson;J. Olejnik;M. Ottosson‐Löfvenius;W. Oechel;F. Parmentier;M. Peichl;N. Pirk;O. Peltola;W. Pawlak;D. Rasse;J. Rinne;G. Shaver;H. Schmid;M. Sottocornola;R. Steinbrecher;T. Sachs;M. Urbaniak;D. Zona;K. Ziemblińska
影响因子：
30.7
作者：
Knoblauch, Christian;Beer, Christian;Pfeiffer, Eva-Maria
通讯作者：
Pfeiffer, Eva-Maria
影响因子：
30.7
作者：
C. Schädel;M. Bader;E. Schuur;C. Biasi;R. Bracho;P. Čapek;S. Baets;K. Diáková;J. Ernakovich
通讯作者：
C. Schädel;M. Bader;E. Schuur;C. Biasi;R. Bracho;P. Čapek;S. Baets;K. Diáková;J. Ernakovich
DOI：
10.1073/pnas.1719903115
发表时间：
2018-04-10
影响因子：
11.1
作者：
McGuire AD;Lawrence DM;Koven C;Clein JS;Burke E;Chen G;Jafarov E;MacDougall AH;Marchenko S;Nicolsky D;Peng S;Rinke A;Ciais P;Gouttevin I;Hayes DJ;Ji D;Krinner G;Moore JC;Romanovsky V;Schädel C;Schaefer K;Schuur EAG;Zhuang Q
通讯作者：
Zhuang Q
影响因子：
12.1
作者：
Strauss, Jens;Schirrmeister, Lutz;Veremeeva, Alexandra
通讯作者：
Veremeeva, Alexandra