ERBE SW vs TLS anomaly

Tropical top of atmosphere ( TOA ) radiation measurements are compared to temperature of the lower stratosphere ( TLS ) from satellite based passive microwave sounding data.

TLS is filtered with a low pass filter to remove the annual variation.

Top of atmosphere, reflected short-wave ( SW ) radiation has had the annual variability removed by subtraction of the annual cycle. Since major eruptions have a notable effect on the annual variations an adaptive method is applied that is detailed here:
https://climategrog.wordpress.com/2015/01/17/on-determination-of-tropical-feedbacks/

There is an apparently permanent drop down in net reflected SW at TOA of approximately 1.8 W/m2. This is synchronous with the change in TLS.

Linear regression of unfiltered tropical TLS, from the annual peak at 1994.63 to the annual peak at 2013.63 :

m_lin = 0.00130434 +/- 0.005792 (444%)
c = 205.534 +/- 0.06168 (0.03001%)

Statistically indistinguishable from zero. No detectable recovery towards pre-eruption values.

There is very little lag between the change in reflected SW and the temperature change, indicating a rapid equilibration. Due to the rarefied nature of the stratosphere this is unsurprising.

Data source: University of Alabama, Huntsville: temperature of the lower stratosphere from satellite microwave sounding unit (MSU) data.

http://vortex.nsstc.uah.edu/data/msu/t4/tlsday_5.6.txt
http://vortex.nsstc.uah.edu/data/msu/t4/tlsdayac8110_5.6.txt

Earth Radiation Budget Experiment (ERBE) Top of atmosphere radiation measurements:
https://eosweb.larc.nasa.gov/sites/default/files/project/erbe/edition3_rev1/Edition3_Rev1_wfov_sf_monthly_tropics.txt

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