scholarly journals On the role of anomalous ocean surface temperatures for promoting the record Madden‐Julian Oscillation in March 2015

2016 ◽  
Vol 43 (1) ◽  
pp. 472-481 ◽  
Author(s):  
Andrew G. Marshall ◽  
Harry H. Hendon ◽  
Guomin Wang
Keyword(s):  
Ocean Surface ◽  
Madden Julian Oscillation ◽  
Surface Temperatures

Modelling the role of Atlantic air-sea interaction in the impact of Madden-Julian Oscillation on South American climate

2018 ◽  
Vol 39 (2) ◽  
pp. 1104-1116 ◽  
Author(s):  
Marcelo Barreiro ◽  
Lina Sitz ◽  
Santiago de Mello ◽  
Ramon Fuentes Franco ◽  
Madeleine Renom ◽  
...  
Keyword(s):  
South American ◽  
Madden Julian Oscillation ◽  
The Impact ◽  
South American Climate

scholarly journals Role of air–sea fluxes and ocean surface density in the production of deep waters in the eastern subpolar gyre of the North Atlantic

Ocean Science ◽  
2021 ◽  
Vol 17 (5) ◽  
pp. 1353-1365
Author(s):  
Tillys Petit ◽  
M. Susan Lozier ◽  
Simon A. Josey ◽  
Stuart A. Cunningham
Keyword(s):  
North Atlantic ◽  
Surface Density ◽  
Ocean Surface ◽  
Density Field ◽  
The North ◽  
Iceland Basin ◽  
Deep Waters ◽  
Water Formation ◽  
Dense Water Formation

Abstract. Wintertime convection in the North Atlantic Ocean is a key component of the global climate as it produces dense waters at high latitudes that flow equatorward as part of the Atlantic Meridional Overturning Circulation (AMOC). Recent work has highlighted the dominant role of the Irminger and Iceland basins in the production of North Atlantic Deep Water. Dense water formation in these basins is mainly explained by buoyancy forcing that transforms surface waters to the deep waters of the AMOC lower limb. Air–sea fluxes and the ocean surface density field are both key determinants of the buoyancy-driven transformation. We analyze these contributions to the transformation in order to better understand the connection between atmospheric forcing and the densification of surface water. More precisely, we study the impact of air–sea fluxes and the ocean surface density field on the transformation of subpolar mode water (SPMW) in the Iceland Basin, a water mass that “pre-conditions” dense water formation downstream. Analyses using 40 years of observations (1980–2019) reveal that the variance in SPMW transformation is mainly influenced by the variance in density at the ocean surface. This surface density is set by a combination of advection, wind-driven upwelling and surface fluxes. Our study shows that the latter explains ∼ 30 % of the variance in outcrop area as expressed by the surface area between the outcropped SPMW isopycnals. The key role of the surface density in SPMW transformation partly explains the unusually large SPMW transformation in winter 2014–2015 over the Iceland Basin.

scholarly journals Trends and Variations in South Pacific Island and Ocean Surface Temperatures

2003 ◽  
Vol 16 (17) ◽  
pp. 2859-2874 ◽  
Author(s):  
C. K. Folland ◽  
M. J. Salinger ◽  
N. Jiang ◽  
N. A. Rayner
Keyword(s):  
South Pacific ◽  
Ocean Surface ◽  
Pacific Island ◽  
Surface Temperatures ◽  
South Pacific Island

scholarly journals Role of Maritime Continent Convection during the Preconditioning Stage of the Madden-Julian Oscillation Observed in CINDY2011/DYNAMO

2015 ◽  
Vol 93A (0) ◽  
pp. 101-114 ◽  
Author(s):  
Hisayuki KUBOTA ◽  
Kunio YONEYAMA ◽  
Jun-Ichi HAMADA ◽  
Peiming WU ◽  
Agus SUDARYANTO ◽  
...  
Keyword(s):  
Madden Julian Oscillation ◽  
Maritime Continent

scholarly journals Parameter Modulation of Madden-Julian Oscillation Behaviors in BCC_CSM1.2: The Key Role of Moisture-Shallow Convection Feedback

Atmosphere ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 241 ◽  
Author(s):  
Kai Huang ◽  
Hong-Li Ren ◽  
Xiangwen Liu ◽  
Pengfei Ren ◽  
Yuntao Wei ◽  
...  
Keyword(s):  
Lower Troposphere ◽  
Latin Hypercube Sampling ◽  
Heavy Precipitation ◽  
Convective Precipitation ◽  
Physical Parameters ◽  
Madden Julian Oscillation ◽  
Shallow Convection ◽  
Climate System Model ◽  
New Strategy

To reveal key parameter-related physical mechanisms in simulating Madden-Julian Oscillation (MJO), seven physical parameters in the convection and cloud parameterization schemes of Beijing Climate Center Climate System Model (BCC_CSM1.2) are perturbed with Latin hypercube sampling method. A new strategy is proposed to select runs with good and poor MJO simulations among 85 generated ones. Outputs and parameter values from good and poor simulations are composited separately for comparison. Among the seven chosen parameters, a decreased value of precipitation efficiency for shallow convection, higher values of relative humidity threshold for low stable clouds and evaporation efficiency for deep convective precipitation are crucial to simulate a better MJO. Changes of the three parameters act together to suppress heavy precipitation and increase the frequency of light rainfall over the Indo-Pacific region, supplying more moisture in low and middle troposphere. As a result of a wetter lower troposphere ahead of the MJO main convection, the low-level moisture preconditioning along with the leading shallow convection tends to be enhanced, favorable for MJO’s further development and eastward propagation. The MJO’s further propagation across the Maritime Continent (MC) in good simulations is accompanied with more land precipitation dominated by shallow convection. Therefore, the above-mentioned three parameters are found to be crucial parameters out of the seven ones for MJO simulation, providing an inspiration for better MJO simulation and prediction with this model. This work is valuable as it highlights the key role of moisture-shallow convection feedback in the MJO dynamics.

scholarly journals The Role of Vegetation in Mitigating Urban Land Surface Temperatures: A Case Study of Munich, Germany during the Warm Season

2015 ◽  
Vol 7 (4) ◽  
pp. 4689-4706 ◽  
Author(s):  
Sadroddin Alavipanah ◽  
Martin Wegmann ◽  
Salman Qureshi ◽  
Qihao Weng ◽  
Thomas Koellner
Keyword(s):  
Land Surface ◽  
Warm Season ◽  
Urban Land ◽  
Surface Temperatures ◽  
Land Surface Temperatures
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