Cloud and radiation budget changes associated with tropical intraseasonal oscillations

  title={Cloud and radiation budget changes associated with tropical intraseasonal oscillations},
  author={Roy W. Spencer and William D. Braswell and John R. Christy and Justin J. Hnilo},
  journal={Geophysical Research Letters},
We explore the daily evolution of tropical intraseasonal oscillations in satellite‐observed tropospheric temperature, precipitation, radiative fluxes, and cloud properties. The warm/rainy phase of a composited average of fifteen oscillations is accompanied by a net reduction in radiative input into the ocean‐atmosphere system, with longwave heating anomalies transitioning to longwave cooling during the rainy phase. The increase in longwave cooling is traced to decreasing coverage by ice clouds… 
Intraseasonal Variability in MERRA Energy Fluxes over the Tropical Oceans
AbstractThis paper investigates intraseasonal variability as represented by the recent NASA Global Modeling and Assimilation Office (GMAO) reanalysis, the Modern-Era Retrospective analysis for
Radiative Feedback Signatures in Amsr-e Sea Surface Temperatures versus Tropospheric Temperatures
Radiative feedbacks in the climate system are the primary uncertainty affecting estimates of anthropogenic global warming and climate change (Knutti & Hergerl, 2008; IPCC, 2007). While the feedbacks
Limits on CO2 Climate Forcing from Recent Temperature Data of Earth
The global atmospheric temperature anomalies of Earth reached a maximum in 1998 which has not been exceeded during the subsequent 10 years. The global anomalies are calculated from the average of
Simple radiative models for surface warming and upper‐troposphere cooling
A simple model of greenhouse‐gas radiative processes intended to make the surface‐warming effect of water‐vapour and CO2 absorption more readily understandable leads to a conclusion that the
Lagrangian Diagnostics of Tropical Deep Convection and Its Effect upon Upper-Tropospheric Humidity
This study combines geostationary water vapor imagery with optical cloud property retrievals and microwave sea surface observations in order to investigate, in a Lagrangian framework, (i) the
Effects of doubled CO2 on tropical sea surface temperatures (SSTs) for onset of deep convection and maximum SST: Simulations based inferences
A primary concern of CO2‐induced warming is the associated rise of tropical (10S‐10N) sea‐surface temperatures (SSTs). GISS Model‐E was used to produce two sets of simulations‐one with the
Correction to “Effects of doubled CO2 on tropical sea surface temperatures (SSTs) for onset of deep convection and maximum SST: Simulations based inferences”
[1] A primary concern of CO2-induced warming is the associated rise of tropical (10S-10N) sea-surface temperatures (SSTs). GISS Model-E was used to produce two sets of simulations-one with the
On the Misdiagnosis of Surface Temperature Feedbacks from Variations in Earth's Radiant Energy Balance
It is concluded that atmospheric feedback diagnosis of the climate system remains an unsolved problem, due primarily to the inability to distinguish between radiative forcing and radiative feedback in satellite radiative budget observations.
On the Misdiagnosis of Climate Feedbacks from Variations in Earth's Radiant Energy Balance
The sensitivity of the climate system to an imposed radiative imbalance remains the largest source of uncertainty in projections of future anthropogenic climate change. Here we present further
A Determination of the Cloud Feedback from Climate Variations over the Past Decade
The climate-cloud feedback is positive, supporting current ideas about how atmospheric carbon dioxide affects global temperature, and there is no correlation in the models between the short- and long-term cloud feedbacks.


Observational Evidence for the Mutual Regulation of the Tropical Hydrological Cycle and Tropical Sea Surface Temperatures
Abstract From the analysis of surface, upper-air, and satellite observations it is suggested that the hydrological cycle associated with the Madden–Julian oscillation acts in the mode of a
Comments on “Tropical Convection and the Energy Balance at the Top of the Atmosphere”
Analyses of the Earth Radiation Budget Experiment (ERBE) data show that the effects of clouds on the solar and thermal infrared radiation in the tropical deep convective regions have a similar
The Influence of the 1998 El Niño upon Cloud-Radiative Forcing over the Pacific Warm Pool.
Clouds cool the climate system by reflecting shortwave radiation and warm it by increasing the atmospheric greenhouse. Previous studies have shown that in tropical regions of deep convection there is
Satellite measurements of sea surface temperature through clouds
Microwave SST retrievals provide insights in a number of areas, including tropical instability waves, marine boundary layer dynamics, and the prediction of hurricane intensity.
An Assessment of Climate Feedbacks in Coupled Ocean–Atmosphere Models
Abstract The climate feedbacks in coupled ocean–atmosphere models are compared using a coordinated set of twenty-first-century climate change experiments. Water vapor is found to provide the largest
Cloud Feedbacks in the Climate System: A Critical Review
Abstract This paper offers a critical review of the topic of cloud–climate feedbacks and exposes some of the underlying reasons for the inherent lack of understanding of these feedbacks and why
Observations of the 40-50-day tropical oscillation - a review
Abstract Observational aspects of the 40–50-day oscillation are reviewed. The oscillation is the result of large-scale circulation cells oriented in the equatorial plane that move eastward from at
Does The Earth Have an Adaptive Infrared Iris
Abstract Observations and analyses of water vapor and clouds in the Tropics over the past decade show that the boundary between regions of high and low free–tropospheric relative humidity is sharp,
Comparison of cloud forcing derived from the Earth Radiation Budget Experiment with that simulated by the NCAR Community Climate Model
A comprehensive comparison of top of atmosphere radiative quantities from the Earth Radiation Budget Experiment (ERBE) with the same quantities from the latest version of the National Center for
How dry is the tropical free troposphere? : Implications for global warming theory
The humidity of the free troposphere is being increasingly scrutinized in climate research due to its central role in global warming theory through positive water vapor feedback. This feedback is the