Title: "How the sea, land, ice, and mountains move the rain” and he says the following about the talk:
"I’ll talk about research using idealized GCMs to pick apart the role of various factors in setting the rainfall distribution on Earth, including simple continents, mountain ranges, the ocean circulation, ice sheets, and vegetation. The use of simple diffusive closures in the atmospheric energy… Read more about ClimaTea Lecture
Speaker: Scott Powell from from Colorado State University
Title:"Circumnavigation and Convective Onset of Successive Madden-Julian Oscillation Events"
Abstract: The Madden-Julian Oscillation (MJO) is a major component of sub-seasonal variability in tropical precipitation, and it also impacts extreme precipitation events in the subtropics and the mid-latitudes. This talk focuses on convective onset of the MJO over the tropical warm pool and the circumnavigation of the precursor equatorial wave that appears to influence onset of successive MJO events. This talk explores… Read more about ClimaTea Lecture
Nathan will be presenting the paper "Observed changes in extreme wet and dry spells during the South Asian summer monsoon season"
Here are his thoughts on the paper:
"Singh et al. examine changes in mean precipitation, precipitation variability, wet spells, and dry spells during the South Asian summer monsoon season for the years 1951-2011. The authors find that mean precipitation is declining while precipitation variability is increasing. Dry spells are becoming… Read more about ClimaTea Lecture
Marena will be presenting on the paper Guo et al. (2015), "Impacts of 20th century aerosol emissions on the South Asian summer monsoon in CMIP5 models:”
Here are her thoughts on the paper:
All-India Monsoon Rainfall is estimated to have declined over the second half of the 20th century, with some attributing this primarily to increased anthropogenic GHGs and others to increases in aerosols. Guo et al. (2015) investigate the effects of aerosols, differentiating between the indirect and direct effects, on Indian monsoon rainfall in the CMIP5 models. In… Read more about ClimaTea Lecture
Title: “Daily Monitoring of the Land Surface of the Earth”
Planet is an integrated aerospace and data analytics company that operates the largest fleet of Earth-imaging satellites. With more than 140 cube-sats now in orbit, Planet is collecting approximately 50 million square kilometers of imagery per day, or 1/3 of the land surface of the Earth (3-5m per pixel, in red, green, blue and near infrared spectral bands). Later in 2017, Planet’s constellation will image the entire land surface of the Earth on a daily basis. Due… Read more about Climate Week Planet Labs event
Colin will be presenting the paper "Dynamics of ice stream temporal variability: Modes, scales, and hysteresis"
Here are his thoughts on the paper:
"Ice from the interior of continental ice sheets such as Greenland or Antartica primarily drains through fast-flowing, localized features called ice streams. These ice streams are known to turn on and off, known as stagnating and activating. The variability in ice stream discharge from the Hudson Strait ice stream of the Laurentide Ice Sheet is likely mechanism behind Heinrich events,… Read more about ClimaTea Journal Club
Wanying will be presenting the paper “Seasonal Variability of the Polar Stratospheric Vortex in an Idealized AGCM with Varying Tropospheric Wave Forcing.”
Here are her thoughts on the paper:
Using an idealized atmospheric model with seasonal cycle, they investigated how the polar stratosphere seasonal variability responds to varying topography. Specifically, they focused on the response in Sudden Stratospheric Warming (SSW) frequency, and the timing of final warmings. K=2 topography is more efficient than k=1 in shifting final warming and… Read more about ClimaTea Journal Club
Title: “Non-rotating convective aggregation and the Madden-Julian Oscillation.”
Abstract: “The Madden-Julian oscillation (MJO) is the dominant mode of tropical intraseasonal variability, but its dynamics remain poorly understood. It has been suggested that the MJO is a form of convective self-aggregation, similar to that seen in non-rotating cloud resolving simulations but on a larger spatial… Read more about Special ClimaTea
Title: “A robust null hypothesis for the potential causes of mega drought in western North America.”
Abstract: Multidecadal megadroughts in western North America are periods of aridity as severe as the worst droughts of the 20th century, but much longer lasting. Here the statistics of these events are evaluated against the null hypothesis that they occur as a result of stochastic forcing with stationary noise statistics… Read more about ClimaTea Lecture
Jiahua will be presenting the attached paper, “Validating atmospheric reanalysis data using tropical cyclones as thermometers”. Here is her thoughts on the paper:
"How tropical climate variability and change has affected and will affect tropical cyclones is usually studied based on the potential intensity theory, in which potential intensity highly depends on the difference between sea surface temperature and the temperature of the free troposphere. However, potential intensities calculated from different reanalysis products can differ substantially from… Read more about ClimaTea Journal Club
Title: "Circulation and Stirring in the Southeast Pacific Ocean and the Scotia Sea Sectors of the Antarctic Circumpolar Current"
Abstract: The large-scale middepth circulation and eddy diffusivities in the southeast Pacific Ocean and Scotia Sea sectors between 110° and 45°W of the Antarctic Circumpolar Current (ACC) are described based on a subsurface quasi-isobaric RAFOS-float-based Lagrangian dataset. These… Read more about ClimaTea Lecture
Joern will be leading a discussion on Renault et al, 2016: "Control and Stabilization of the Gulf Stream by Oceanic Current Interaction with the Atmosphere”. Joern’s thoughts on the paper are:
"Western boundary currents transport vast amounts of heat poleward, providing considerable warming to the atmosphere along their paths. Where these currents separate from the coast and what paths they take, however, is controlled by dynamics we do not fully understand. Moreover, the accurate representation of these currents in numerical models has been notoriously… Read more about ClimaTea Journal Club
Cristi Proistosescu will be presenting on Richardson et al. (2016): "Reconciled climate response estimates from climate models and the energy budget of Earth." His thoughts on the paper and additional background reading are below.
Richardson et al resolve discrepancies in transient climate response (TCR) estimates between models and observations by considering sampling and processing aspects of observational datasets. The HadCRUT4 temperature record preferentially samples slow warming regions and it uses a blend of air temperature measurements over… Read more about ClimaTea Journal Club
Packard Chan will be presenting on Horton et. al. (2015). His thoughts on the paper are:
The possible link between changes in atmospheric circulation and extreme temperature is recently a hot topic of research. However, the long-term change in atmospheric circulation remains inconclusive. Employing self-organizing map (SOM) cluster analysis for seven regions of the Northern Hemisphere, this paper identified statistically significant trends in the occurrence of some circulation patterns. By doing a quantitative partitioning, the paper found that while a… Read more about ClimaTea Lecture