State of the climate in 2018

M. Ades, R. Adler, Laura S. Aldeco, G. Alejandra, Eric J. Alfaro, Vannia Aliaga-Nestares, Richard P. Allan, Rob Allan, Lincoln M. Alves, Jorge A. Amador, J. K. Andersen, John Anderson, Derek S. Arndt, C. Arosio, Kevin Arrigo, César Azorin-Molina, M. Yu Bardin, Jonathan Barichivich, Sandra Barreira, Stephen BaxterH. E. Beck, Andreas Becker, Gerald D. Bell, Nicolas Bellouin, M. Belmont, Angela Benedetti, Imme Benedict, G. H. Bernhard, Paul Berrisford, David I. Berry, Lynette Bettio, U. S. Bhatt, B. K. Biskaborn, Peter Bissolli, Kevin L. Bjella, J. K. Bjerke, Eric S. Blake, Stephen Blenkinsop, Jessica Blunden, Olivier Bock, Michael G. Bosilovich, Olivier Boucher, J. E. Box, Tim Boyer, Geir Braathen, Francis G. Bringas, David H. Bromwich, Alrick Brown, R. Brown, Timothy J. Brown, S. A. Buehler, Luis Cáceres, Blanca Calderón, Suzana J. Camargo, Jayaka D. Campbell, Diego A. Campos Diaz, J. Cappelen, Laura Carrea, Seth B. Carrier, Brendan R. Carter, Anabel Y. Castro, Ivona Cetinic, Don P. Chambers, Lin Chen, Lijing Cheng, Vincent Y.S. Cheng, Hanne H. Christiansen, John R. Christy, E. S. Chung, Federico Claus, Kyle R. Clem, Caio A.S. Coelho, Melanie Coldewey-Egbers, Steve Colwell, Owen R. Cooper, Cathy Cosca, Curt Covey, Lawrence Coy, Cristina P. Dávila, Sean M. Davis, Elvira de Eyto, Richard A.M. de Jeu, Jos De Laat, B. Decharme, Curtis L. Degasperi, Doug Degenstein, Mesut Demircan, C. Derksen, K. R. Dhurmea, Larry Di Girolamo, Howard J. Diamond, Eliecer Diaz, Fransisco A. Diniz, Ed J. Dlugokencky, Kathleen Dohan, Martin T. Dokulil, A. Johannes Dolman, Catia M. Domingues, Ricardo Domingues, Markus G. Donat, Wouter A. Dorigo, D. S. Drozdov, Matthew L. Druckenmiller, Robert J.H. Dunn, Imke Durre, Geoff S. Dutton, M. Elkharrim, James W. Elkins, H. E. Epstein, Jhan C. Espinoza, James S. Famiglietti, Sinead L. Farrell, R. S. Fausto, Richard A. Feely, Z. Feng, Chris Fenimore, X. Fettweis, Vitali E. Fioletov, Johannes Flemming, Ryan L. Fogt, B. C. Forbes, Michael J. Foster, S. D. Francis, Bryan A. Franz, Richard A. Frey, Stacey M. Frith, Lucien Froidevaux, Catherine Ganter, J. Garforth, Sebastian Gerland, John Gilson, Karin Gleason, Nadine Gobron, S. Goetz, Stanley B. Goldenberg, Gustavo Goni, Alison Gray, Jens Uwe Grooß, Alexander Gruber, Guojun Gu, Charles Chip P. Guard, S. K. Gupta, Dimitri Gutiérrez, Christian Haas, S. Hagos, Sebastian Hahn, Leo Haimberger, Brad D. Hall, Michael S. Halpert, Benjamin D. Hamlington, E. Hanna, I. Hanssen-Bauer, Ian Harris, Wilco Hazeleger, Q. He, Andrew K. Heidinger, Richard R. Heim, D. L. Hemming, Stefan Hendricks, Rafael Hernández, H. E. Hersbach, Hugo G. Hidalgo, Shu Peng Ben Ho, R. M. Holmes, Chuanmin Hu, Boyin Huang, Katherine Hubbard, Daan Hubert, Dale F. Hurst, Iolanda Ialongo, J. A. Ijampy, Antje Inness, Victor Isaac, K. Isaksen, Masayoshi Ishii, Martin O. Jeffries, Svetlana Jevrejeva, G. Jia, C. Jiménez, Xiangze Jin, Viju John, Bjørn Johnsen, Gregory C. Johnson, Kenneth S. Johnson, Bryan Johnson, Philip D. Jones, Guillaume Jumaux, Khadija Kabidi, J. W. Kaiser, Erdem M. Karaköylü, S. R. Karlsen, Mandy Karnauskas, Seiji Kato, A. Fazl Kazemi, Christopher Kelble, Linda M. Keller, John Kennedy, A. L. Kholodov, Mahbobeh Khoshkam, R. Kidd, Rachel Killick, Hyungjun Kim, S. J. Kim, A. D. King, Brian A. King, Z. Kipling, Philip J. Klotzbach, John A. Knaff, Johanna Korhonen, Natalia N. Korshunova, Natalya A. Kramarova, D. P. Kratz, Andries Kruger, Michael C. Kruk, Thomas Krumpen, L. Labbé, C. Ladd, Mónika Lakatos, Kaisa Lakkala, Mark A. Lander, Peter Landschützer, Chris W. Landsea, Neil P. Lareau, Waldo Lavado-Casimiro, Matthew A. Lazzara, T. C. Lee, Eric Leuliette, Michelle L’heureux, Bailing Li, Tim Li, Jan L. Lieser, J. Y. Lim, I. I. Lin, Hongxing Liu, Ricardo Locarnini, Norman G. Loeb, Craig S. Long, Luis A. López, Andrew M. Lorrey, Diego Loyola, Rick Lumpkin, Jing Jia Luo, K. Luojus, John M. Lyman, G. V. Malkova, Gloria L. Manney, S. S. Marchenko, José A. Marengo, Dora Marin, Allison B. Marquardt Collow, John J. Marra, Wlodzimierz Marszelewski, B. Martens, Rodney Martínez-Güingla, Robert A. Massom, Linda May, Michael Mayer, Matthew Mazloff, Charlotte McBride, M. McCabe, J. W. McClelland, Daniel J. McEvoy, Simon McGree, Tim R. McVicar, Carl A. Mears, Walt Meier, Andrew Meijers, Ademe Mekonnen, G. Mengistu Tsidu, W. Paul Menzel, Christopher J. Merchant, Michael P. Meredith, Mark A. Merrifield, Ben Miller, Diego G. Miralles, Noelia Misevicius, Gary T. Mitchum, Y. Mochizuki, Didier Monselesan, Stephen A. Montzka, Natali Mora, Colin Morice, Kobi Mosquera-Vásquez, Awatif E. Mostafa, T. Mote, L. Mudryk, Jens Mühle, A. Brett Mullan, Rolf Müller, R. Myneni, Eric R. Nash, Nicholas J. Nauslar, R. Steven Nerem, Paul A. Newman, Julien P. Nicolas, Juan José Nieto, Jeannette Noetzli, Tim J. Osborn, Emily Osborne, J. Overland, Lamjav Oyunjargal, T. Park, Richard J. Pasch, Reynaldo Pascual Ramírez, Maria Asuncion Pastor Saavedra, Andrew M. Paterson, Petra R. Pearce, Mauri S. Pelto, Don Perovich, Irina Petropavlovskikh, Alexandre B. Pezza, C. Phillips, David Phillips, G. Phoenix, Bernard Pinty, Michael Pitts, S. Po-Chedley, Chris Polashenski, W. Preimesberger, Sarah G. Purkey, Nelson Quispe, Madhavan Rajeevan, C. L. Rakotoarimalala, Andrea M. Ramos, Isabel Ramos, W. Randel, M. K. Raynolds, James Reagan, Phillip Reid, Christoph Reimer, Samuel Rémy, Jayashree V. Revadekar, A. D. Richardson, Jacqueline Richter-Menge, Robert Ricker, A. Ripaldi, David A. Robinson, Matthew Rodell, Ernesto Rodriguez Camino, Vladimir E. Romanovsky, Josyane Ronchail, Karen H. Rosenlof, Benajamin Rösner, Chris Roth, A. Rozanov, James A. Rusak, Elke Rustemeier, T. Rutishäuser, Jean Baptiste Sallée, Ahira Sánchez-Lugo, Michelle L. Santee, P. Sawaengphokhai, Amal Sayouri, Ted A. Scambos, T. Scanlon, Alvaro S. Scardilli, Verena Schenzinger, S. Geoffey Schladow, Claudia Schmid, Martin Schmid, P. Schoeneich, Carl J. Schreck, H. B. Selkirk, Serhat Sensoy, Lei Shi, A. I. Shiklomanov, Nikolai I. Shiklomanov, A. Shimpo, Christopher A. Shuman, David A. Siegel, Fatou Sima, Adrian J. Simmons, C. J.P.P. Smeets, Adam Smith, Sharon L. Smith, B. Soden, Viktoria Sofieva, T. H. Sparks, Jacqueline Spence, R. G.M. Spencer, Sandra Spillane, A. K. Srivastava, P. J. Stabeno, Paul W. Stackhouse, Sharon Stammerjohn, Diane M. Stanitski, Wolfgang Steinbrecht, José L. Stella, M. Stengel, Tannecia S. Stephenson, Susan E. Strahan, Casey Streeter, Dimitri A. Streletskiy, Sunny Sun-Mack, A. Suslova, Adrienne J. Sutton, Sebastiann Swart, William Sweet, Kenneth S. Takahashi, S. E. Tank, Michael A. Taylor, M. Tedesco, S. J. Thackeray, Philip R. Thompson, Bertrand Timbal, M. L. Timmermans, Skie Tobin, H. Tømmervik, Kleareti Tourpali, Katja Trachte, M. Tretiakov, Blair C. Trewin, Joaquin A. Triñanes, Adrian R. Trotman, Mark Tschudi, Mari R. Tye, D. van As, R. S.W. van de Wal, Ronald J. van der A, Robin van der Schalie, Gerard van der Schrier, Guido R. van der Werf, Chiel van Heerwaarden, Cedric J. Van Meerbeeck, Piet Verburg, G. Vieira, Lucie A. Vincent, Holger Vömel, Russell S. Vose, D. A. Walker, J. E. Walsh, Bin Wang, Hui Wang, Lei Wang, M. Wang, Mengqiu Wang, Ray Wang, Sheng Hung Wang, Rik Wanninkhof, Shohei Watanabe, Mark Weber, Melinda Webster, Albrecht Weerts, Robert A. Weller, Toby K. Westberry, Gesa A. Weyhenmeyer, Matthew J. Widlansky, Susan E. Wijffels, Anne C. Wilber, Jeanette D. Wild, Kate M. Willett, Takmeng Wong, E. F. Wood, R. Iestyn Woolway, Yan Xue, Xungang Yin, Lisan Yu, Eduardo Zambrano, Sadegh Zeyaeyan, Huai Min Zhang, Peiqun Zhang, Guanguo Zhao, Lin Zhao, Xinjia Zhou, Zhiwei Zhu, Jerry R. Ziemke, Markus Ziese, Andrea Andersen, Jessicca Griffin, Gregory Hammer, S. Elizabeth Love-Brotak, Deborah J. Misch, Deborah B. Riddle, Sara W. Veasey

Research output: Contribution to journalReview article

Abstract

In 2018, the dominant greenhouse gases released into Earth's atmosphere-carbon dioxide, methane, and nitrous oxide-continued their increase. The annual global average carbon dioxide concentration at Earth's surface was 407.4 ± 0.1 ppm, the highest in the modern instrumental record and in ice core records dating back 800 000 years. Combined, greenhouse gases and several halogenated gases contribute just over 3 W m−2 to radiative forcing and represent a nearly 43% increase since 1990. Carbon dioxide is responsible for about 65% of this radiative forcing. With a weak La Niña in early 2018 transitioning to a weak El Niño by the year's end, the global surface (land and ocean) temperature was the fourth highest on record, with only 2015 through 2017 being warmer. Several European countries reported record high annual temperatures. There were also more high, and fewer low, temperature extremes than in nearly all of the 68-year extremes record. Madagascar recorded a record daily temperature of 40.5°C in Morondava in March, while South Korea set its record high of 41.0°C in August in Hongcheon. Nawabshah, Pakistan, recorded its highest temperature of 50.2°C, which may be a new daily world record for April. Globally, the annual lower troposphere temperature was third to seventh highest, depending on the dataset analyzed. The lower stratospheric temperature was approximately fifth lowest. The 2018 Arctic land surface temperature was 1.2°C above the 1981-2010 average, tying for third highest in the 118-year record, following 2016 and 2017. June's Arctic snow cover extent was almost half of what it was 35 years ago. Across Greenland, however, regional summer temperatures were generally below or near average. Additionally, a satellite survey of 47 glaciers in Greenland indicated a net increase in area for the first time since records began in 1999. Increasing permafrost temperatures were reported at most observation sites in the Arctic, with the overall increase of 0.1°-0.2°C between 2017 and 2018 being comparable to the highest rate of warming ever observed in the region. On 17 March, Arctic sea ice extent marked the second smallest annual maximum in the 38-year record, larger than only 2017. The minimum extent in 2018 was reached on 19 September and again on 23 September, tying 2008 and 2010 for the sixth lowest extent on record. The 23 September date tied 1997 as the latest sea ice minimum date on record. First-year ice now dominates the ice cover, comprising 77% of the March 2018 ice pack compared to 55% during the 1980s. Because thinner, younger ice is more vulnerable to melting out in summer, this shift in sea ice age has contributed to the decreasing trend in minimum ice extent. Regionally, Bering Sea ice extent was at record lows for almost the entire 2017/18 ice season. For the Antarctic continent as a whole, 2018 was warmer than average. On the highest points of the Antarctic Plateau, the automatic weather station Relay (74°S) broke or tied six monthly temperature records throughout the year, with August breaking its record by nearly 8°C. However, cool conditions in the western Bellingshausen Sea and Amundsen Sea sector contributed to a low melt season overall for 2017/18. High SSTs contributed to low summer sea ice extent in the Ross and Weddell Seas in 2018, underpinning the second lowest Antarctic summer minimum sea ice extent on record. Despite conducive conditions for its formation, the ozone hole at its maximum extent in September was near the 2000-18 mean, likely due to an ongoing slow decline in stratospheric chlorine monoxide concentration. Across the oceans, globally averaged SST decreased slightly since the record El Niño year of 2016 but was still far above the climatological mean. On average, SST is increasing at a rate of 0.10° ± 0.01°C decade−1 since 1950. The warming appeared largest in the tropical Indian Ocean and smallest in the North Pacific. The deeper ocean continues to warm year after year. For the seventh consecutive year, global annual mean sea level became the highest in the 26-year record, rising to 81 mm above the 1993 average. As anticipated in a warming climate, the hydrological cycle over the ocean is accelerating: dry regions are becoming drier and wet regions rainier. Closer to the equator, 95 named tropical storms were observed during 2018, well above the 1981-2010 average of 82. Eleven tropical cyclones reached Saffir-Simpson scale Category 5 intensity. North Atlantic Major Hurricane Michael's landfall intensity of 140 kt was the fourth strongest for any continental U.S. hurricane landfall in the 168-year record. Michael caused more than 30 fatalities and $25 billion (U.S. dollars) in damages. In the western North Pacific, Super Typhoon Mangkhut led to 160 fatalities and $6 billion (U.S. dollars) in damages across the Philippines, Hong Kong, Macau, mainland China, Guam, and the Northern Mariana Islands. Tropical Storm Son-Tinh was responsible for 170 fatalities in Vietnam and Laos. Nearly all the islands of Micronesia experienced at least moderate impacts from various tropical cyclones. Across land, many areas around the globe received copious precipitation, notable at different time scales. Rodrigues and Réunion Island near southern Africa each reported their third wettest year on record. In Hawaii, 1262 mm precipitation at Waipā Gardens (Kauai) on 14-15 April set a new U.S. record for 24-h precipitation. In Brazil, the city of Belo Horizonte received nearly 75 mm of rain in just 20 minutes, nearly half its monthly average. Globally, fire activity during 2018 was the lowest since the start of the record in 1997, with a combined burned area of about 500 million hectares. This reinforced the long-term downward trend in fire emissions driven by changes in land use in frequently burning savannas. However, wildfires burned 3.5 million hectares across the United States, well above the 2000-10 average of 2.7 million hectares. Combined, U.S. wildfire damages for the 2017 and 2018 wildfire seasons exceeded $40 billion (U.S. dollars).

Original languageEnglish (US)
Pages (from-to)SI-S305
JournalBulletin of the American Meteorological Society
Volume100
Issue number9
DOIs
StatePublished - Jan 1 2019

ASJC Scopus subject areas

  • Atmospheric Science

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    Ades, M., Adler, R., Aldeco, L. S., Alejandra, G., Alfaro, E. J., Aliaga-Nestares, V., Allan, R. P., Allan, R., Alves, L. M., Amador, J. A., Andersen, J. K., Anderson, J., Arndt, D. S., Arosio, C., Arrigo, K., Azorin-Molina, C., Bardin, M. Y., Barichivich, J., Barreira, S., ... Veasey, S. W. (2019). State of the climate in 2018. Bulletin of the American Meteorological Society, 100(9), SI-S305. https://doi.org/10.1175/2019BAMSStateoftheClimate.1