PlumX Metrics
Embed PlumX Metrics

Revisiting the relationship among metrics of tropical expansion

Journal of Climate, ISSN: 0894-8755, Vol: 31, Issue: 18, Page: 7565-7581
2018
  • 66
    Citations
  • 0
    Usage
  • 68
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    66
    • Citation Indexes
      66
  • Captures
    68

Article Description

There is mounting evidence that the width of the tropics has increased over the last few decades, but there are large differences in reported expansion rates. This is, likely, in part due to the wide variety of metrics that have been used to define the tropical width. Here we perform a systematic investigation into the relationship among nine metrics of the zonal-mean tropical width using preindustrial control and abrupt quadrupling of CO simulations from a suite of coupled climate models. It is shown that the latitudes of the edge of the Hadley cell, the midlatitude eddy-driven jet, the edge of the subtropical dry zones, and the Southern Hemisphere subtropical high covary interannually and exhibit similar long-term responses to a quadrupling of CO. However, metrics based on the outgoing longwave radiation, the position of the subtropical jet, the break in the tropopause, and theNorthernHemisphere subtropical high have very weak covariations with the abovemetrics and/or respond differently to increases in CO and thus are not good indicators of the expansion of the Hadley cell or subtropical dry zone. The differing variability and responses to increases in CO amongmetrics highlights that care is needed when choosing metrics for studies of the width of the tropics and that it is important tomake sure the metric used is appropriate for the specific phenomena and impacts being examined.

Bibliographic Details

Darryn W. Waugh; W. J.M. Seviour; K. M. Grise; S. M. Davis; N. Davis; O. Adam; S. W. Son; I. R. Simpson; P. W. Staten; A. C. Maycock; C. C. Ummenhofer; T. Birner; A. Ming

American Meteorological Society

Earth and Planetary Sciences

Provide Feedback

Have ideas for a new metric? Would you like to see something else here?Let us know