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When the National Oceanic and Atmospheric Association (NOAA) declared the beginning of an El Ni帽o event on June 8, 2023, the recurring climate pattern featured in headlines all over the world as media outlets sought to cover its anticipated impacts.

A recent Water @ Wilson event 鈥撯��The Significance of the Coming El Ni帽o: Understanding the Science and Preparing for its Impacts鈥濃�攂rought together experts at the 乐鱼 体育 to explain the complex science behind El Ni帽o and explore its regional implications. The speakers also surveyed the policy tools at our disposal to prepare for its significant climate effects.

Sarah Kapnick, Chief Scientist at NOAA, unpacked what the association鈥檚 declaration of an El Ni帽o actually means, stating that there was an 鈥�84 percent chance of it reaching moderate El Ni帽o and a 56 percent chance of reaching strong El Ni帽o by the winter.鈥� She added that the NOAA鈥檚 declaration of an El Ni帽o only refers to changes in a portion of the Pacific, however, and does not encompass regional warming scenarios elsewhere, such as along the coast of South America.

Whatever the strength of this particular El Ni帽o event, its effects will be felt on a broad scale. In her opening remarks, Maxine Burkett, Deputy Secretary for Oceans, Fisheries, and Polar Affairs, pointed out that 鈥渢he ocean, marine life, and communities that rely on both are truly bearing the brunt of climate impacts鈥攁nd this year, those stresses are going to be exacerbated by the El Ni帽o-Southern Oscillation.鈥�

Meeting the immediate humanitarian needs of communities that will bear the brunt of El Ni帽o is an important part of any response. But this is only part of the solution. Effectively preparing for the coming impacts will also require understanding both the social and political vulnerability of countries and regions to these sorts of ecological shocks. 

What is El Ni帽o?

Any deeper comprehension of El Ni帽o鈥檚 effects requires a clear understanding of this climate pattern. El Ni帽o is the warmer companion to a cooler shift in temperature known as La Ni帽a. Together, the two phenomena create the 鈥攔ival climate shifts that sporadically alter the normal ocean conditions in the Pacific Ocean every two to seven years.

In the Pacific, trade winds traditionally blow east to west, taking warm surface water from the Americas towards Asia, which is replaced by deeper, nutrient-rich, and colder water along the west coast of the Americas through a process called . Yet as trade winds weaken, El Ni帽o brings warmer ocean water east, back into the equatorial Pacific, reducing upwelling near the Americas.

The result for global climate? The presence of warmer water in the east forces the Pacific jet stream to dip south. Not only does this change have consequences for the weather in North America, but the broader shift in Pacific Ocean temperature can have varied effects around the globe.

Kapnick noted that shifting ocean temperatures also change rainfall patterns throughout the world, which can create extreme drought in some areas and flooding in others and sets up 鈥減roblems for society as well as changes in agricultural productivity in different regions.鈥�

Historically, El Ni帽o has also led to more hurricanes in the Pacific and fewer hurricanes in the Atlantic. Yet overall climate trends may alter this pattern. Warmer global temperatures make it likely to be a 鈥渘ear normal鈥� hurricane season in the Atlantic and an 鈥渁bove normal鈥� season in the Pacific.

Is the World Prepared?

The question of how global warming will affect El Ni帽o and other patterns is key to shaping responses. As ECSP Director Lauren Risi observed: 鈥淓l Ni帽o is not new, but in an era increasingly shaped by climate change, El Ni帽o is also changing.鈥�

And as El Ni帽o changes, its effects on different geographic regions around the world and the communities that inhabit them change too. The capacity of social and governance structures to deal with the impacts of extreme events plays a key role in vulnerability to El Ni帽o. Experts from Latin America, South and Southeast Asia, as well as Africa, offered insight into the vulnerability of each region to this global phenomenon.

Latin America is one example of a region in which countries lack updated early warning systems that could help mitigate El Ni帽o鈥檚 impacts. Rodney Martinez, Representative for North America, Central America, and the Caribbean for the World Meteorological Organization, pointed out that 鈥�58 percent of South American countries鈥� have no early warning systems, and many are plagued by political strife and poverty that hamper their 鈥渃limate response capacity.鈥� 

Martinez said that the unusually strong El Ni帽o of 1997-1998 offered a lesson in the importance of meteorological infrastructure and a more stable society. 鈥淲e do not just need information,鈥� he said, but social and political challenges in each country must also be addressed 鈥渢o ensure the best response.鈥�

South and Southeast Asia are also no strangers to the intersection of extreme weather and socio-political challenges. In El Ni帽o years, this region has historically experienced more drought and higher average temperatures, impacting public health and agricultural yields. Yet Sarang Shidore, Director of Studies at the Quincy Institute for Responsible Statecraft, observed that while storms normally decrease in the region during El Ni帽o, warmer ocean temperatures may generate a normal cyclone season.

Shidore also noted that while is among the most vulnerable countries in the region to climate change, it is also trying to prepare its defenses. The country has invested close to $10 billion in cyclone shelters, embankments, early warning systems, and evacuation plans. And through its National Adaptation Plan, he added, Bangladesh is 鈥減reparing 20 or 22 existing towns and cities to absorb the kind of migration we are going to see.鈥�

In India, Shidore pointed to that helped to reduce the number of deaths that could have been caused by the recent formation of Cyclone Biparjoy. Yet while Bangladesh and India offer positive examples of preparedness, he added that violence and instability in places like Myanmar could be exacerbated by the El Ni帽o鈥檚 effects and spill over into its neighboring countries. (In fact, that nation鈥檚 to cyclone affected communities.) 鈥淭here is no one single story鈥� in the region, he observed.

Milaku Yirga, Ethiopia Country Director for Mercy Corps, stated that the same could be said for Africa. In Ethiopia, he observed, 鈥渢here is a high vulnerability [to El Ni帽o] based on recorded drought from the previous couple of years.鈥� This state of affairs also has severely impacted the capacity of governance systems and communities in the country.

Yirga added that Ethiopia鈥檚 government, in concert with international partners, has provided aid to meet the immediate needs of people, in the form of digital early warning systems and 鈥渓ow-cost technology to disperse water away from areas into lowlands.鈥� However, he lamented that this activity also takes away from long-term investment in Ethiopia鈥檚 development, which could improve the country鈥檚 overall resilience to the impacts of shocks like El Ni帽o.

Seeking Better Responses

Experts predict that, as this El Ni帽o progresses, it is likely to be more intense and diverge from historical trends. But Burkett says that the unpredictability of this climate pattern鈥攅specially in the context of large climate change鈥攊s part of the threat. 鈥淏ecause each El Ni帽o event is unique,鈥� she said, 鈥渋t is incredibly difficult to predict the impact.鈥� Meeting the needs of communities affected by El Ni帽o demands that 鈥渨e need to be ready to provide rapid, varied, and nuanced responses.鈥�

Burkett pointed to the President鈥檚 Emergency Plan for Adaptation and Resilience (PREPARE) as one example of this type of response. PREPARE will allow the U.S. government to 鈥減ut early warning systems and climate information in the hands of people who need it鈥� and 鈥渂uild the resilience of health, water, and infrastructure systems鈥tressed by climate change and further stressed by El Ni帽o.鈥� 

Other panelists echoed Burkett鈥檚 call for varied response mechanisms, including the need for more and stronger transnational partnerships, as well as the need for multilateral financial assistance. Shidore noted that 鈥渃limate finance can really make a difference鈥� for countries that have the skills but lack the financial means to prepare for the impacts of El Ni帽o. Yet he added that climate finance mechanisms also require something that many countries lack: effective governance structures to implement funding.

Martinez observed that fashioning effective responses requires a 鈥渇ocus on the structural issues, otherwise, we will invest a lot of resources in several initiatives that will not get the engagement of all countries.鈥� He concluded that 鈥渢his is a matter of capacity building at the highest level and investing more in proactive risk management strategies.鈥�

One key takeaway? El Ni帽o will not only change weather patterns. It will also reveal the intertwined relationship between social and ecological risk. Therefore, preparing for the impacts of El Ni帽o will require proactive policies that target the intersection between ecological and sociopolitical vulnerability.

For updated information on the progression of this El Ni帽o, visit: .

Written by Angus Soderberg, edited by Richard Byrne.