Simulated changes in active/break spells during the Indian summer monsoon due to enhanced CO2 concentrations: assessment from selected coupled atmosphere–ocean global climate models

2007 ◽  
Vol 27 (7) ◽  
pp. 837-859 ◽  
Author(s):  
Sujata K. Mandke ◽  
A. K. Sahai ◽  
M. A. Shinde ◽  
Susmitha Joseph ◽  
R. Chattopadhyay
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Climate Models ◽  
Global Climate ◽  
Global Climate Models ◽  
Co2 Concentrations

On the relationship between Indian Ocean Dipole, Indian summer monsoon and ENSO

2021 ◽  
Author(s):  
Annalisa Cherchi ◽  
Pascal Terray ◽  
Satyaban Bishoyi Ratna ◽  
Virna Meccia ◽  
Sooraj K.P.
Keyword(s):  
Indian Ocean ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Indian Ocean Dipole ◽  
Climate Models ◽  
Southern Oscillation ◽  
Global Climate ◽  
Global Climate Models ◽  
The Future ◽  
The Indian Ocean

<p>The Indian Ocean Dipole (IOD) is one of the dominant modes of variability of the tropical Indian Ocean and it has been suggested to have a crucial role in the teleconnection between the Indian summer monsoon and El Nino Southern Oscillation (ENSO). The main ideas at the base of the influence of the IOD on the ENSO-monsoon teleconnection include the possibility that it may strengthen summer rainfall over India, as well as the opposite, and also that it may produce a remote forcing on ENSO itself. The Indian Ocean has been experiencing a warming, larger than any other basins, since the 1950s. During these decades, the summer monsoon rainfall over India decreased and the frequency of Indian Ocean Dipole (IOD) events increased. In the future the IOD is projected to further increase in frequency and amplitude with mean conditions mimicking the characteristics of its positive phase. Still, state of the art global climate models have large biases in representing IOD and monsoon mean state and variability, with potential consequences for properties and related teleconnections projected in the future. This works collects a review study of the influence of the IOD on the ISM and its relationship with ENSO, as well as new results on IOD projections comparing CMIP5 and CMIP6 models.</p>

scholarly journals Projection of Indian summer monsoon climate in 2041-2060 by multiregional and global climate models

2015 ◽  
Vol 120 (5) ◽  
pp. 1776-1793 ◽  
Author(s):  
Xiaorui Niu ◽  
Shuyu Wang ◽  
Jianping Tang ◽  
Dong-Kyou Lee ◽  
William Gutowski ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Climate Models ◽  
Global Climate ◽  
Global Climate Models ◽  
Monsoon Climate

Probabilistic prediction of Indian summer monsoon rainfall using global climate models

2011 ◽  
Vol 107 (3-4) ◽  
pp. 441-450 ◽  
Author(s):  
Makarand A. Kulkarni ◽  
Nachiketa Acharya ◽  
Sarat C. Kar ◽  
U. C. Mohanty ◽  
Michael K. Tippett ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Climate Models ◽  
Monsoon Rainfall ◽  
Indian Summer Monsoon Rainfall ◽  
Global Climate ◽  
Summer Monsoon Rainfall ◽  
Global Climate Models ◽  
Probabilistic Prediction

Climate Feedbacks in CCSM3 under Changing CO2 Forcing. Part I: Adapting the Linear Radiative Kernel Technique to Feedback Calculations for a Broad Range of Forcings

2012 ◽  
Vol 25 (15) ◽  
pp. 5260-5272 ◽  
Author(s):  
Alexandra K. Jonko ◽  
Karen M. Shell ◽  
Benjamin M. Sanderson ◽  
Gokhan Danabasoglu
Keyword(s):  
Climate Models ◽  
Climate Model ◽  
Global Climate ◽  
Global Climate Model ◽  
Global Climate Models ◽  
Climate Feedbacks ◽  
Radiative Fluxes ◽  
Co2 Concentrations ◽  
Climate Model Simulations ◽  
Linear Technique

Abstract Climate feedbacks vary strongly among climate models and continue to represent a major source of uncertainty in estimates of the response of climate to anthropogenic forcings. One method to evaluate feedbacks in global climate models is the radiative kernel technique, which is well suited for model intercomparison studies because of its computational efficiency. However, the usefulness of this technique is predicated on the assumption of linearity between top-of-atmosphere (TOA) radiative fluxes and feedback variables, limiting its application to simulations of small climate perturbations, where nonlinearities can be neglected. This paper presents an extension of the utility of this linear technique to large forcings, using global climate model simulations forced with CO2 concentrations ranging from 2 to 8 times present-day values. Radiative kernels depend on the model’s radiative transfer algorithm and climate base state. For large warming, kernels based on the present-day climate significantly underestimate longwave TOA flux changes and somewhat overestimate shortwave TOA flux changes. These biases translate to inaccurate feedback estimates. It is shown that a combination of present-day kernels and kernels computed using a large forcing climate base state leads to significant improvement in the approximation of TOA flux changes and increased reliability of feedback estimates. While using present-day kernels results in a climate sensitivity that remains constant, using the new kernels shows that sensitivity increases significantly with each successive doubling of CO2 concentrations.

scholarly journals Global warming and monsoon climate

MAUSAM ◽  
2021 ◽  
Vol 52 (1) ◽  
pp. 245-262
Author(s):  
M. LAL ◽  
SANJEEV K. SINGH
Keyword(s):  
Summer Monsoon ◽  
Climate Models ◽  
Asian Summer Monsoon ◽  
Global Climate ◽  
Indian Subcontinent ◽  
Monsoon Season ◽  
Global Climate Models ◽  
Sulfate Aerosols ◽  
Study Region ◽  
Near Surface

The response of the Asian summer monsoon to transient increases of greenhouse gases (GHGs) and sulfate aerosols in the Earth's atmosphere is examined using the data generated in numerical experiments with available coupled atmosphere-ocean global climate models (A-O GCMs). A comparison of observed and model-simulated trends in monthly mean near-surface temperature and rainfall over the region provides evidence of skill of the A-O GCMs in simulating the regional climatology. The potential role of the sulfate aerosols in obscuring the GHG- induced warming over the Indian subcontinent is discussed. Even though the simulated total seasonal rainfall over the Indian subcontinent during summer monsoon season is underestimated in most of the A-O GCMs, the year to year variability in simulated monsoon rainfall over the study region is found to be in fair agreement with the observed climatology.

scholarly journals Properties of mid-latitude cirrus cloud from surface Ka-band radar observations during 2014–2017

2020 ◽  
Author(s):  
Juan Huo ◽  
Yufang Tian ◽  
Xue Wu ◽  
Congzheng Han ◽  
Bo Liu ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Climate Models ◽  
Global Climate ◽  
Winter Monsoon ◽  
Global Climate Models ◽  
Cirrus Clouds ◽  
Cirrus Cloud ◽  
Formation And Evolution ◽  
The Mean

Abstract. The physical properties and radiative role of cirrus clouds remain one of the uncertainties in the Earth–atmosphere system. In this study, we present a detailed analysis of cirrus properties based on four years of surface millimetre wavelength radar measurements in Beijing, China, where summer monsoon from the ocean and winter monsoon from the continent prevails alternately, resulting in various cirrus clouds. More than 6600 cirrus clusters were studied to quantify the properties of cirrus clouds, such as the height, optical depth and horizontal extent, which can serve as a reference for parameterization and characterization in global climate models. In addition, comparison between cirrus clusters formed under summer monsoon and winter monsoon indicates the different formation and evolution mechanisms of cirrus. Statistically, the temperature of more than 90 % of cirrus bins are below −15 °C. The dependence of the radar reflectivity of cirrus particles on the height and temperature was also observed in this study, indicating that the reflectivity of cirrus bins increases (decreases) as the temperature (height) increases. In addition, it was found that there is a strong linear relationship between the mean reflectivity and the cirrus cloud depth. Due to various synoptic circumstances, the cirrus clouds in summer are warmer, higher, and thicker, with larger reflectivity than that in winter; in particular, the mean cloud-top height of cirrus clouds in summer is 2.5 km higher than that in winter. It was found that most cirrus clusters in winter are likely to be the in situ origin type cirrus but some cirrus clusters in summer are the in situ origin cirrus and others are the liquid origin type cirrus.

Extreme Events in High Resolution CMCC Regional and Global Climate Models

2011 ◽  
Author(s):  
Enrico Scoccimarro ◽  
Silvio Gualdi ◽  
Antonella Sanna ◽  
Edoardo Bucchignani ◽  
Myriam Montesarchio
Keyword(s):  
High Resolution ◽  
Extreme Events ◽  
Climate Models ◽  
Global Climate ◽  
Global Climate Models
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