NASA To Conduct First Global Water Survey From Space (reuters.com) 6
A NASA-led international satellite mission was set for blastoff from Southern California early on Thursday on a major Earth science project to conduct a comprehensive survey of the world's oceans, lakes and rivers for the first time. Reuters reports: Dubbed SWOT, short for Surface Water and Ocean Topography, the advanced radar satellite is designed to give scientists an unprecedented view of the life-giving fluid covering 70% of the planet, shedding new light on the mechanics and consequences of climate change. A Falcon 9 rocket, owned and operated by billionaire Elon Musk's commercial launch company SpaceX, was set to liftoff before dawn on Thursday from the Vandenberg U.S. Space Force Base, about 170 miles (275 km) northwest of Los Angeles, to carry SWOT into orbit. If all goes as planned, the SUV-sized satellite will produce research data within several months.
Nearly 20 years in development, SWOT incorporates advanced microwave radar technology that scientists say will collect height-surface measurements of oceans, lakes, reservoirs and rivers in high-definition detail over 90% of the globe. The data, compiled from radar sweeps of the planet at least twice every 21 days, will enhance ocean-circulation models, bolster weather and climate forecasts and aid in managing scarce freshwater supplies in drought-stricken regions, according to researchers. One major thrust of the mission is to explore how oceans absorb atmospheric heat and carbon dioxide in a natural process that moderates global temperatures and climate change. [...] SWOT's ability to discern smaller surface features also be used to study the impact of rising ocean levels on coastlines.
Nearly 20 years in development, SWOT incorporates advanced microwave radar technology that scientists say will collect height-surface measurements of oceans, lakes, reservoirs and rivers in high-definition detail over 90% of the globe. The data, compiled from radar sweeps of the planet at least twice every 21 days, will enhance ocean-circulation models, bolster weather and climate forecasts and aid in managing scarce freshwater supplies in drought-stricken regions, according to researchers. One major thrust of the mission is to explore how oceans absorb atmospheric heat and carbon dioxide in a natural process that moderates global temperatures and climate change. [...] SWOT's ability to discern smaller surface features also be used to study the impact of rising ocean levels on coastlines.
Turning point calculation (Score:5, Insightful)
According to the article, a major question this is supposed to be answering is "What is the turning point at which oceans start releasing, rather than absorbing, huge amounts of heat back into the atmosphere and accelerate global warming, rather than limiting it?"
That seems clear enough, it should be when the average ocean temperature rises to be higher than the average air temperature, and then thermal conduction should work in the opposite direction. But given the size of the ocean, I think that would take quite a while.
There must be some detail I'm missing, does someone have some info?
Re: (Score:3)
That really depend on ocean currents. For instance Europe is as warm as it is, because the Ocean there releases a lot of heat it absorbed further sourth, heating up Europe and cooling down the Caribbean.
Re: (Score:3)
There's at least two problems with that simple response.
The oceans and atmosphere are not at a single temperature; those temperatures change in time and space.
Evaporation and condensation can move a lot of energy around without differences in temperature being necessary.
So now we can watch... (Score:4, Insightful)
This is the baseline (Score:2, Redundant)
Remember, folks, this survey will be a baseline. Any claims of doom and gloom based on the initial observations are bullsh*t. And really any trends shorter than a few years are most likely meaningless. Maybe over decades there might be some useful information but predictions shouldn't be taken seriously especially when economics are involved.