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WANG Jun^1,2, BAO Qing¹, Ning ZENG³, LIU Yimin¹, WU Guoxiong¹, and JI Duoying⁴

 

¹State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;

²University of the Chinese Academy of Sciences, Beijing 100049;

³Department of Atmospheric and Oceanic Science and Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA;

⁴College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875.

 

Abstract

Earth System Models (ESMs) are fundamental tools for understanding climate-carbon feedback. An ESM version of the Flexible Global Ocean-Atmosphere-Land System model (FGOALS) was recently developed within the IPCC AR5 Coupled Model Intercomparison Project Phase 5 (CMIP5) modeling framework, and we describe the development of this model through the coupling of a dynamic global vegetation and terrestrial carbon model with FGOALS-s2. The performance of the coupled model is evaluated as follows.

The simulated global total terrestrial gross primary production (GPP) is 124.4 PgC yr−1 and net primary production (NPP) is 50.9 PgC yr−1. The entire terrestrial carbon pools contain about 2009.9 PgC, comprising 628.2 PgC and 1381.6 PgC in vegetation and soil pools, respectively. Spatially, in the tropics, the seasonal cycle of NPP and net ecosystem production (NEP) exhibits a dipole mode across the equator due to migration of the monsoon rainbelt, while the seasonal cycle is not so significant in Leaf Area Index (LAI). In the subtropics, especially in the East Asian monsoon region, the seasonal cycle is obvious due to changes in temperature and precipitation from boreal winter to summer. Vegetation productivity in the northern mid-high latitudes is too low, possibly due to low soil moisture there.

On the interannual timescale, the terrestrial ecosystem shows a strong response to ENSO. The model-simulated Niño3.4 index and total terrestrial NEP are both characterized by a broad spectral peak in the range of 2–7 years. Further analysis indicates their correlation coefficient reaches −0.7 when NEP lags the Niño3.4 index for about 1–2 months.

 

Key Words: Earth System Model (ESM), Dynamic Global Vegetation Model (DGVM), carbon cycle, seasonal cycle, interannual variability

 

PUBLISHED BY: ADVANCES IN ATMOSPHERIC SCIENCES, 2013, 30 (6): 1549–1559.

 

DOWNLOAD PDF: http://link.springer.com/content/pdf/10.1007/s00376-013-2169-1.pdf