Weimerskirch said the researchers will now study «the learning phase of young frigate birds, how they learn to use these extreme conditions... Also we will test whether living in
different oceanic conditions — Galapagos, Western Pacific and Indian Ocean — results in different migratory and dispersal strategies.»
For example: could
different oceanic circulation rates change the
oceanic CO2 sink / source behaviour, or could
different atmospheric
conditions change the mixing rates of atmospheric gases hence modify their affect on the solar forcing?
The most likely candidate for that climatic variable force that comes to mind is solar variability (because I can think of no other force that can change or reverse in a
different trend often enough, and quick enough to account for the historical climatic record) and the primary and secondary effects associated with this solar variability which I feel are a significant player in glacial / inter-glacial cycles, counter climatic trends when taken into consideration with these factors which are, land / ocean arrangements, mean land elevation, mean magnetic field strength of the earth (magnetic excursions), the mean state of the climate (average global temperature), the initial state of the earth's climate (how close to interglacial - glacial threshold
condition it is) the state of random terrestrial (violent volcanic eruption, or a random atmospheric circulation /
oceanic pattern that feeds upon itself possibly) / extra terrestrial events (super-nova in vicinity of earth or a random impact) along with Milankovitch Cycles.