Salinity effects on the 2014 warm “Blob” in the Northeast Pacific

ZHI Hai; LIN Pengfei; ZHANG Rong-Hua; CHAI Fei; LIU Hailong

doi:10.1007/s13131-019-1450-2

Volume 38 Issue 9

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ZHI Hai, LIN Pengfei, ZHANG Rong-Hua, CHAI Fei, LIU Hailong. Salinity effects on the 2014 warm “Blob” in the Northeast Pacific[J]. Acta Oceanologica Sinica, 2019, 38(9): 24-34. doi: 10.1007/s13131-019-1450-2

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Salinity effects on the 2014 warm “Blob” in the Northeast Pacific

doi: 10.1007/s13131-019-1450-2

1.
College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China
2.
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China;College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3.
Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
4.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China;School of Marine Sciences, University of Maine, Orono 04469-5706, USA

Received Date: 2018-10-03

Abstract

Abstract

A significant strong, warm "Blob" (a large circular water body with a positive ocean temperature anomaly) appeared in the Northeast Pacific (NEP) in the boreal winter of 2013-2014, which induced many extreme climate events in the US and Canada. In this study, analyses of the temperature and salinity anomaly variations from the Array for Real-time Geostrophic Oceanography (Argo) data provided insights into the formation of the warm "Blob" over the NEP. The early negative salinity anomaly dominantly contributed to the shallower mixed layer depth (MLD) in the NEP during the period of 2012-2013. Then, the shallower mixed layer trapped more heat in the upper water column and resulted in a warmer sea surface temperature (SST), which enhanced the warm "Blob". The salinity variability contributed to approximately 60% of the shallowing MLD related to the warm "Blob". The salinity anomaly in the warm "Blob" region resulted from a combination of both local and nonlocal effects. The freshened water at the surface played a local role in the MLD anomaly. Interestingly, the MLD anomaly was more dependent on the local subsurface salinity anomaly in the 100-150 m depth range in the NEP. The salinity anomaly in the 50-100 m depth range may be linked to the anomaly in the 100-150 m depth range by vertical advection or mixing. The salinity anomaly in the 100-150 m depth range resulted from the eastward transportation of a subducted water mass that was freshened west of the dateline, which played a nonlocal role. The results suggest that the early salinity anomaly in the NEP related to the warm "Blob" may be a precursor signal of interannual and interdecadal variabilities.
- warm “Blob”,
- mixed layer depth,
- surface and subsurface salinity anomalies

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References

Adler R F, Huffman G J, Chang A, et al. 2003. The version-2 global precipitation climatology project (GPCP) monthly precipitation analysis (1979-present). Journal of Hydrometeorology, 4(6):1147-1167, doi: 10.1175/1525-7541(2003)004<1147:TVGPCP>2.0.CO;2

Ballabrera-Poy J, Murtugudde R, Busalacchi A J. 2002. On the potential impact of sea surface salinity observations on ENSO predictions. Journal of Geophysical Research, 107(C12):8007, doi: 10.1029/2001JC000834

Baxter S, Nigam S. 2015. Key role of the north Pacific oscillation-west Pacific pattern in generating the extreme 2013/14 North American winter. Journal of Climate, 28(20):8109-8117, doi: 10.1175/JCLI-D-14-00726.1

Blunden J, Arndt D S. 2015. State of the Climate in 2014. Bulletin of the American Meteorological Society, 96(7):ES1-ES32, doi: 10.1175/2015BAMSStateoftheClimate.1

Bond N A, Cronin M F, Freeland H, et al. 2015. Causes and impacts of the 2014 warm anomaly in the NE Pacific. Geophysical Research Letters, 42(9):3414-3420, doi: 10.1002/2015GL063306

Bosc C, Delcroix T, Maes C. 2009. Barrier layer variability in the western Pacific warm pool from 2000 to 2007. Journal of Geophysical Research, 114(C6):C06023, doi: 10.1029/2008JC005187

de Boyer Montegut C, Madec G, Fischer A S, et al. 2004. Mixed layer depth over the global ocean:an examination of profile data and a profile-based climatology. Journal of Geophysical Research, 109(C12):C12003, doi: 10.1029/2004JC002378

di Lorenzo E, Liguori G, Schneider N, et al. 2015. ENSO and meridional modes:a null hypothesis for Pacific climate variability. Geophysical Research Letters, 42(21):9440-9448, doi: 10.1002/2015GL066281

di Lorenzo E, Mantua N. 2016. Multi-year persistence of the 2014/15 north pacific marine heatwave. Nature Climate Change, 6:1042-1047, doi: 10.1038/nclimate3082

Fedorov A V, Pacanowski R C, Philander S G, et al. 2004. The effect of salinity on the wind-driven circulation and the thermal structure of the upper ocean. Journal of Physical Oceanography, 34(9):1949-1966, doi: 10.1175/1520-0485(2004)034<1949:TEOSOT>2.0.CO;2

Freeland H, Denman K, Wong C S, et al. 1997. Evidence of change in the winter mixed layer in the Northeast Pacific Ocean. Deep Sea Research Part I:Oceanographic Research Papers, 44(12):2117-2129, doi: 10.1016/S0967-0637(97)00083-6

Freeland H, Whitney F. 2014. Unusual warming in the Gulf of Alaska. Pices Press, 22(2):51-52

Hackert E, Ballabrera-Poy J, Busalacchi A J, et al. 2011. Impact of sea surface salinity assimilation on coupled forecasts in the tropical Pacific. Journal of Geophysical Research, 116(C5):C05009, doi: 10.1029/2010JC006708

Hartmann D L. 2015. Pacific sea surface temperature and the winter of 2014. Geophysical Research Letters, 42(6):1894-1902, doi: 10.1002/2015GL063083

Hu Zengzhen, Kumar A, Jha B, et al. 2017. Persistence and Predictions of the Remarkable Warm Anomaly in the Northeastern Pacific Ocean during 2014-16. Journal of Climate, 30(2):689-701, doi: 10.1175/JCLI-D-16-0348.1

Huang Boyin, Mehta V M. 2005. Response of the Pacific and Atlantic oceans to interannual variations in net atmospheric freshwater. Journal of Geophysical Research, 110(C8):C08008, doi: 10.1029/2004JC002830

Johnson B K, Bryan F O, Grodsky S A, et al. 2016. Climatological annual cycle of the salinity budgets of the subtropical maxima. Journal of Physical Oceanography, 46(10):2981-2994, doi: 10.1175/JPO-D-15-0202.1

Kara A B, Rochford P A, Hurlburt H E. 2000. An optimal definition for ocean mixed layer depth. Journal of Geophysical Research, 105(C7):16803-16821, doi: 10.1029/2000JC900072

Kintisch E. 2015. The Blob' invades pacific, flummoxing climate experts. Science, 348(6230):17-18, doi: 10.1126/science.348.6230.17

Liu Hailong, Grodsky S A, Carton J A. 2009. Observed subseasonal variability of oceanic barrier and compensated layers. Journal of Climate, 22(22):6104-6119, doi: 10.1175/2009JCLI2974.1

Liu Lingling, Huang Ruixin. 2012. The global subduction/obduction rates:their interannual and decadal variability. Journal of Climate, 25(4):1096-1115, doi: 10.1175/2011JCLI4228.1

Palmer T. 2014. Record-breaking winters and global climate change. Science, 344(6186):803-804, doi: 10.1126/science.1255147

Sprintall J, Tomczak M. 1992. Evidence of the barrier layer in the surface layer of the tropics. Journal of Geophysical Research, 97(C5):7305-7316, doi: 10.1029/92JC00407

Tseng Y H, Ding Ruiqiang, Huang Xiaomeng. 2017. The warm Blob in the northeast Pacific-the bridge leading to the 2015/16 El Ni?o. Environmental Research Letters, 12(5):054019, doi: 10.1088/1748-9326/aa67c3

van Oldenborgh G J, Haarsma R, de Vries H, et al. 2015. Cold extremes in North America vs. mild weather in Europe:the winter of 2013-14 in the context of a warming world. Bulletin of the American Meteorological Society, 96(5):707-714

Wang S Y, Hipps L, Gillies R R, Yoon J H. 2014. Probable causes of the abnormal ridge accompanying the 2013-2014 California drought:ENSO precursor and anthropogenic warming footprint. Geophysical Research Letters, 41(9):3220-3226, doi: 10.1002/2014GL059748

Whitney F A. 2015. Anomalous winter winds decrease 2014 transition zone productivity in the NE Pacific. Geophysical Research Letters, 42(2):428-431, doi: 10.1002/2014GL062634

Williams A P, Seager R, Abatzoglou J T, et al. 2015. Contribution of anthropogenic warming to California drought during 2012-2014. Geophysical Research Letters, 42(16):6819-6828, doi: 10.1002/2015GL064924

Yoon J H, Wang S Y S, Gillies R R. et al 2015. Increasing water cycle extremes in California and in relation to ENSO cycle under global warming. Nature Communications, 6:8657, doi: 10.1038/ncomms9657

Yu L S, Jin X Z, Weller R A. 2008. Multidecade global flux datasets from the objectively analyzed air-sea fluxes (OAFlux) Project:latent and sensible heat fluxes, ocean evaporation, and related surface meteorological variables. Massachusetts:Woods Hole Oceanographic Institution, 64

Yu Bin, Zhang Xuebin. 2015. A physical analysis of the severe 2013/2014 cold winter in North America. Journal of Geophysical Research, 120(19):10149-10165, doi: 10.1002/2015JD023116

Zhang Ronghua, Busalacchi A J. 2009. Freshwater flux (FWF)-induced oceanic feedback in a hybrid coupled model of the tropical Pacific. Journal of Climate, 22:853-879, doi: 10.1175/2008JCLI2543.1

Zhang Ronghua, Gao Chuan, Kang Xianbiao, et al. 2015. ENSO modulations due to interannual variability of freshwater forcing and ocean biology-induced heating in the tropical Pacific. Scientific Reports, 5:18506, doi: 10.1038/srep18506

Zhang Ronghua, Wang Guihua, Chen Dake, et al. 2010. Interannual biases induced by freshwater flux and coupled feedback in the tropical Pacific. Monthly Weather Review, 138(5):1715-1737, doi: 10.1175/2009MWR3054.1

Zhao Mei, Hendon H H, Alves O, et al. 2013. Impact of salinity constraints on the simulated mean state and variability in a coupled seasonal forecast model. Monthly Weather Review, 141(1):388-402, doi: 10.1175/MWR-D-11-00341.1

Zheng Fei, Zhang Ronghua. 2012. Effects of interannual salinity variability and freshwater flux forcing on the development of the 2007/08 La Ni?a event diagnosed from Argo and satellite data. Dynamics of Atmospheres and Oceans, 57:45-57, doi: 10.1016/j.dynatmoce.2012.06.002

Zheng Fei, Zhang Ronghua, Zhu Jiang. 2014. Effects of interannual salinity variability on the barrier layer in the western-central equatorial Pacific:A diagnostic analysis from Argo. Advances in Atmospheric Sciences, 31:532-542, doi: 10.1007/s00376-013-3061-8

Zhu Jieshun, Huang Bohua, Zhang Ronghua, et al. 2014. Salinity anomaly as a trigger for ENSO events. Scientific Reports, 4:6821, doi: 10.1038/srep06821

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