Using successive versions of a global climate model, we show how convective transport to the free troposphere of the humidity evaporated at the surface or, reciprocally, entrainment of dry air from the free troposphere into the mixed layer, controls surface evaporative cooling and then sea surface temperature. This control is as important as the radiative effect of boundary layer clouds on radiation. Those aspects are shown to be improved when activating a mass flux representation of the organized structures of the convective boundary layer coupled to eddy diffusion, the so‐called “thermal plume model,” leading to an increased near‐surface drying compared to the use of turbulent diffusion alone. Controlling detrainment by air properties from just above the boundary layer allows the thermal plume model to be valid for both cumulus and stratocumulus regimes, improving the contrast in near‐surface humidity between the trade winds region and East Tropical oceans. Using pairs of stand‐alone atmospheric simulations forced by sea surface temperature and of coupled atmosphere‐ocean simulations, we show how the improvement of the surface fluxes that arise from this improved physics projects into an improvement of the representation of sea surface temperature patterns in the coupled model, and in particular into a reduction of the East Tropical Ocean warm bias. The work presented here led to the bias reduction in sea surface temperature in the Institute Pierre Simon Laplace coupled model, IPSL‐CM6A, developed recently for the 6th phase of the Coupled Model Intercomparison Project, CMIP6.

中文翻译：

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热带海面温度的对流边界层控制

使用全球气候模型的后续版本，我们展示了对流运输到表面上的湿气蒸发到自由对流层的过程，或者相反，是如何将干燥空气从自由对流层夹带到混合层中，控制表面蒸发冷却，然后控制海面温度。这种控制与边界层云对辐射的辐射效应一样重要。当激活与涡流扩散耦合的对流边界层的有组织结构的质量通量表示（即所谓的“热羽状模型”）时，这些方面已得到改善，与使用相比，导致了近地表干燥的增加。仅湍流扩散。通过从边界层正上方的空气属性控制减阻，使热羽模型对于积云和层积云都有效，从而改善了顺风区和东热带海洋之间近地表湿度的对比度。通过使用成对的受海面温度强迫的独立大气模拟以及耦合的大气-海洋模拟，我们展示了这种改进的物理现象所产生的表面通量的改善如何转化为海面温度模式在海平面中的表示的改善。耦合模式，尤其是减少了东热带海洋的温暖偏见。此处介绍的工作导致了Pierre Simon Laplace研究所耦合模型IPSL-CM6A的海面温度偏差降低，