Oceanography Seminar

November 14, 3:00pm - 4:15pm
Mānoa Campus, MSB 100

Pedro DiNezio
Assistant Researcher
IPRC

“Dynamics and impacts of 2-year La Niña events”

Abstract: The observational record shows that about 35% of La Niña events last for two years or longer. In contrast, the majority of El Niño events quickly transition into La Niña in less than one year. Historically, the dynamics of La Niña have been considered as the mirror image of El Niño. However, the causes of this asymmetry in the duration of El Niño and La Niña are unknown. This issue is important for the prediction of drought over southern tier of the United States, where persistent La Niña conditions can lead to multi-year drought.

The first part of my talk will focus on the impact of these 2-year La Niña events on drought over North America. In particular, I will explore the physical processes responsible for the observed intensification and expansion of La Niña droughts during the second year. In the second part, I will explore the physical processes responsible for the multi-year persistence of La Niña in the Community Climate System Model version 4 (CCSM4) – a coupled climate model that simulates 2-year La Niña realistically. Using a nonlinear version of the delayed oscillator equation I will show that a nonlinearity of the delayed thermocline feedback that limits the rate at which heat content anomalies are replenished is responsible for the extended duration of La Niña. To conclude, I will discuss implications for the prediction of the termination of La Niña.


Ticket Information
FREE

Event Sponsor
Oceanography, Mānoa Campus

More Information
808-956-7633

Share by email

Thursday, November 14

 
7:30am Maui Campus, Pilina Bldg., Wellness Center
8:00am Hawaiʻi Campus, Bldg 379 Walkway Manono Campus
9:00am Hawaiʻi Campus, Bldg 379 Walkway Manono Campus
10:00am Hawaiʻi Campus, Bldg 379 Walkway Manono Campus
10:30am Hawaiʻi Campus, Kaneikeao Manono Campus
12:00pm Mānoa Campus, St. John 11
12:00pm Mānoa Campus, LSP 4A
12:00pm Mānoa Campus, Henke Hall 325
12:00pm Mānoa Campus, Kamakakuokalani 211
12:00pm Hawaiʻi Campus, Bldg 379 Walkway Manono Campus
12:00pm Maui Campus, Pa`ina Cafe
12:30pm Hawaiʻi Campus, Kaneikeao Manono Campus
1:30pm Mānoa Campus, Orvis Auditorium
2:00pm Mānoa Campus, Kumuola Foundation lo'i in Manoa Valley
3:00pm Maui Campus, UHMC Great Lawn
3:00pm Mānoa Campus, MSB 100
3:00pm Mānoa Campus, Art Building, University of Hawai'i Art Gallery
5:00pm Hawaiʻi Campus, Manono Campus Cafeteria
7:00pm West Oʻahu Campus, Campus Center Multipurpose Room C-208
7:30pm Mānoa Campus, Hamilton Library Alcove
11:30pm Hawaiʻi Campus, Kaneikeao Manono Campus