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Reply to comment by Karnauskas et al. on "Equatorial Pacific coral geochemical records show recent weakening of the Walker circulation"

Journal Article


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Abstract


  • In our paper describing a new coral record from Butaritari, we hypothesized that comparing the temporal trends in our records to coral records from farther east in the equatorial Pacific may support the evidence for a weakening of a Walker circulation, documented elsewhere in the literature [Power and Smith, 2007; Tokinaga et al., 2012]. Weakening of the Walker circulation is expected under global warming due to an imbalance in the rate of change in different aspects of the hydrological cycle [Vecchi and Soden, 2007].

    Here we

    provide additional analyses, which confirm that our reconstruction [Carilli et al., 2014] shows a long-term

    weakening of the Walker circulation over 1972–1998. We also document that significant decadal variations

    in Walker circulation strength, and for particular choices of start and end years over which trends are

    calculated, are able to show slight Walker strengthening. Overall, we conclude that Walker circulation

    variations are more nuanced than either our original publication [Carilli et al., 2014] or the subsequent

    Karnauskas et al. [2015] comment would suggest. Karnauskas et al. [2015] also provide a detailed analysis

    of Equatorial Undercurrent (EUC) activity near the Gilbert Islands and argue that the EUC does not strongly

    affect Butaritari. Our original publication did not claim to find significant EUC/Butaritari linkages, and we

    appreciate the diligence of Karnauskas et al. [2015] for ruling this out as a possibility.

Authors


  •   Carilli, Jessica E. (external author)
  •   McGregor, Helen V.
  •   Gaudry, Jessica J. (external author)
  •   Donner, Simon D. (external author)
  •   Gagan, Michael K. (external author)
  •   Stevenson, Samantha (external author)
  •   Wong, Henri (external author)
  •   Fink, David

Publication Date


  • 2015

Citation


  • Carilli, J. E., McGregor, H. V., Gaudry, J. J., Donner, S. D., Gagan, M. K., Stevenson, S., Wong, H. & Fink, D. (2015). Reply to comment by Karnauskas et al. on "Equatorial Pacific coral geochemical records show recent weakening of the Walker circulation". Paleoceanography, 30 (5), 575-582.

Scopus Eid


  • 2-s2.0-84929691852

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4162&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3139

Number Of Pages


  • 7

Start Page


  • 575

End Page


  • 582

Volume


  • 30

Issue


  • 5

Place Of Publication


  • http://onlinelibrary.wiley.com/doi/10.1002/2015PA002783/full

Abstract


  • In our paper describing a new coral record from Butaritari, we hypothesized that comparing the temporal trends in our records to coral records from farther east in the equatorial Pacific may support the evidence for a weakening of a Walker circulation, documented elsewhere in the literature [Power and Smith, 2007; Tokinaga et al., 2012]. Weakening of the Walker circulation is expected under global warming due to an imbalance in the rate of change in different aspects of the hydrological cycle [Vecchi and Soden, 2007].

    Here we

    provide additional analyses, which confirm that our reconstruction [Carilli et al., 2014] shows a long-term

    weakening of the Walker circulation over 1972–1998. We also document that significant decadal variations

    in Walker circulation strength, and for particular choices of start and end years over which trends are

    calculated, are able to show slight Walker strengthening. Overall, we conclude that Walker circulation

    variations are more nuanced than either our original publication [Carilli et al., 2014] or the subsequent

    Karnauskas et al. [2015] comment would suggest. Karnauskas et al. [2015] also provide a detailed analysis

    of Equatorial Undercurrent (EUC) activity near the Gilbert Islands and argue that the EUC does not strongly

    affect Butaritari. Our original publication did not claim to find significant EUC/Butaritari linkages, and we

    appreciate the diligence of Karnauskas et al. [2015] for ruling this out as a possibility.

Authors


  •   Carilli, Jessica E. (external author)
  •   McGregor, Helen V.
  •   Gaudry, Jessica J. (external author)
  •   Donner, Simon D. (external author)
  •   Gagan, Michael K. (external author)
  •   Stevenson, Samantha (external author)
  •   Wong, Henri (external author)
  •   Fink, David

Publication Date


  • 2015

Citation


  • Carilli, J. E., McGregor, H. V., Gaudry, J. J., Donner, S. D., Gagan, M. K., Stevenson, S., Wong, H. & Fink, D. (2015). Reply to comment by Karnauskas et al. on "Equatorial Pacific coral geochemical records show recent weakening of the Walker circulation". Paleoceanography, 30 (5), 575-582.

Scopus Eid


  • 2-s2.0-84929691852

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4162&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3139

Number Of Pages


  • 7

Start Page


  • 575

End Page


  • 582

Volume


  • 30

Issue


  • 5

Place Of Publication


  • http://onlinelibrary.wiley.com/doi/10.1002/2015PA002783/full