Cyclone-Cyclone Interactions through the Ocean Pathway

TitleCyclone-Cyclone Interactions through the Ocean Pathway
Publication TypeJournal Article
Year of Publication2014
AuthorsBalguru, Karthik, Taraphdar Sourav, L. Leung Ruby, Foltz Gregory R., and Knaff John A.
JournalGeophysical Research Letters
Date Published10/2014
Abstract / Summary

The intense sea surface temperature cooling caused by tropical cyclone-induced mixing lasts several weeks and may thus influence a later cyclone passing over it. Using a 28 year analysis spanning the North Atlantic, eastern Pacific, and Northwest Pacific, we systematically demonstrate that, on average, when tropical cyclones encounter lingering wakes, they experience sea surface temperatures that are ∼0.25–0.5°C colder. Consequently, the intensification rates are ~0.4 - 0.7 ms -1/36h lower for cyclones when they interact with wakes, consistent with the maximum potential intensity theory. The probability for cyclones to encounter lingering wakes varies positively with cyclone frequency, is ∼10% on average, and has been as high as 27%–37% in the past. These large interaction probabilities reduce the mean intensification rates for cyclones by 3%–6% on average and by ∼12%–15% during the most active years. “Cyclone-cyclone interactions” may therefore represent a mechanism through which tropical cyclones self-regulate their activity to an extent on intraseasonal time scales.

DOI10.1002/2014GL061489
Journal: Geophysical Research Letters
Year of Publication: 2014
Date Published: 10/2014

The intense sea surface temperature cooling caused by tropical cyclone-induced mixing lasts several weeks and may thus influence a later cyclone passing over it. Using a 28 year analysis spanning the North Atlantic, eastern Pacific, and Northwest Pacific, we systematically demonstrate that, on average, when tropical cyclones encounter lingering wakes, they experience sea surface temperatures that are ∼0.25–0.5°C colder. Consequently, the intensification rates are ~0.4 - 0.7 ms -1/36h lower for cyclones when they interact with wakes, consistent with the maximum potential intensity theory. The probability for cyclones to encounter lingering wakes varies positively with cyclone frequency, is ∼10% on average, and has been as high as 27%–37% in the past. These large interaction probabilities reduce the mean intensification rates for cyclones by 3%–6% on average and by ∼12%–15% during the most active years. “Cyclone-cyclone interactions” may therefore represent a mechanism through which tropical cyclones self-regulate their activity to an extent on intraseasonal time scales.

DOI: 10.1002/2014GL061489
Citation:
Balguru, K, S Taraphdar, LR Leung, GR Foltz, and JA Knaff.  2014.  "Cyclone-Cyclone Interactions through the Ocean Pathway."  Geophysical Research Letters.  https://doi.org/10.1002/2014GL061489.