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19 January 2014 [Publications]
Condensation with horizontal temperature gradients, Caribbean jet and human reference group

Three items today.

Our new paper with A.V. Nefiodov on the theory of condensation-induced atmospheric dynamics. Why these studies matter for BR see here.

Dr. Germán Poveda and colleagues published a study on atmospheric moisture transport in the Amazon. An original idea based on the biotic pump concept was put forward that the so-called Caribbean Low Level Jet that supplies a major share of moisture to Colombia (blue line in the figure) recurves towards the southeast because of pressure gradients associated with intense condensation over Colombian rainforests. West Colombia is the rainiest place on Earth and receives 12.5 meters precipitation annually.

Fig. 1 (part) (Poveda et al. (2014) Water Resources Research doi:10.1002/2013WR014087)
Fig. 1 (part) from Poveda et al. 2014. Seasonal cycle of average 925 hPa horizontal wind velocity (m/s) over South America during 19792012. Notice the recurvature of the CHOCO low-level jet toward the east after crossing the Equator, and the recurvarture of the Caribbean low-level jet (CLLJ) toward the southeast after crossing the Panama isthmus, both converging on the world-record rainfall region of western Colombia. Data source: ERA-Interim reanalysis. Green arrows correspond to 7 m/s.

Poveda, G., L. Jaramillo, and L. F. Vallejo (2014), Seasonal precipitation patterns along pathways of South American low-level jets and aerial rivers, Water Resour. Res., 50, doi: 10.1002/2013WR014087. PDF

An interesting study in PNAS illustrates the relatively small size of the genetically encoded natural reference group in humans (the study is discussed here). Having analyzed telephone calls of a large number of people the researchers found that we humans make new friends at the expense of old ones following the "one in, one out" pattern and keeping our reference group relatively constant. Previously we estimated the natural reference group in humans to not significantly exceed one hundred individuals. Human existence in modern multimillion societies violates one of the basic ecological rights of Homo sapiens -- the right for social significance.

Great cormorant landing to her reference group
Great cormorant landing to her reference group