Plastic aside, there is new evidence that there could be a slowdown in the global meridional circulation
, the ocean's great conveyor belt that is responsible for moving heat and nutrients on a planetary scale.
Trends are shown based on (a) the latitude of the tropospheric (850-300 hPa) zonal wind maxima (JET); and (b) the latitude where the mean meridional circulation
(MMC) at 500 hPa becomes zero on the poleward side of the subtropical maximum for 7 reanalyses (black) and 10 CAM5 AMIP-constant-forcing simulations driven by the forced (FSST; cyan) and unforced (UFSST; blue) component of SSTs.
 showed that when a meridional circulation
prevails over the subtropics and tropics in East Asia, a meridional circulation
also occurs in the SH (especially in Australia) and that a mass transport from the SH to the NH is observed.
Sometimes it is broken by development of meridional circulation
, which causes large fluctuations and sharp changes in the course of meteorological elements [1, 2].
A statistically significant correlation was detected between the atmospheric circulation indices and storminess at Vilsandi, while the characteristics of zonal circulation have a positive correlation and those of meridional circulation
are related to no or a negative correlation (Jaagus et al.
McManus, J.E, Francois, R., Gherardi, J.M., Keigwin, L.D., and Brown-Leger, S., 2004, Collapse and rapid resumption of Atlantic meridional circulation
linked to deglacial climate changes: Nature, v.
"This study highlights the importance of monitoring and improving measurement of the sun's meridional circulation
. In order to improve predictions of the solar cycle, we need a strong effort to understand large-scale patterns of solar plasma motion," said Roger Ulrich.
Beyond the lower stratosphere, the signal acquires a zonal symmetric behavior with the largest negative anomalies in month 3, which is known to be related to the mean meridional circulation
as will be explained next.
In answer to Jim Jones' question, it has been well established that the main driving force behind the meridional circulation
of the North Atlantic conveyor belt, with ultimate worldwide impacts, is the descent of cold high-density saline water into the abyssal ocean at high northern latitudes.
The north-south extent of the features may reveal meridional circulation
high in the Jovian stratosphere (higher than the visible cloud deck), facilitated by the injection of impact debris high above each impact site.
Worthen, 2011: Warm and saline events embedded in the meridional circulation
of the northern North Atlantic.
Before the 1980s, research on tropospheric and stratospheric temperature relied upon regional cases, such as the concept of residual circulation put forward by Brewer and Dobson, which is the vertical meridional circulation
of the troposphere and stratosphere from the equator to the poles .