World Climate Research Program - International conference on reanalyses

Thanks to all who attended and contributed to making this a very successful conference! The conference provided the worldwide community with the opportunity to review and discuss the major observations and modeling research associated with reanalysis. There were 244 attendees from 26 countries of which 24 were students and 55 early career scientists (see listing of attendees). Read More

Agency Priorities: An Open Panel Discussion with Conference Participants with the help of

The goal of is to facilitate comparison between reanalysis and observational data sets. Evaluative content provided by reanalysis developers, observationalists, and users; and links to detailed data descriptions, data access methods, analysis and plotting tools, and data set references are available.

About the Conference

The 4th WCRP International Conference on Reanalyses (ICR4) provides an opportunity for the global community to review and discuss the major observations and modeling research associated with reanalyses, including the current uncertainties, such as consistency of the time series, and the complexity of Earth system.

Characterizing the uncertainty and quality of reanalyses is a task that reaches far beyond the international community of developing institutions, and into the interdisciplinary research community, especially those using the reanalyses products in their research and applications.


Atmospheric, oceanic and land retrospective analyses, or “reanalyses,” have become fundamental tools for weather, ocean, hydrology and climate research. They continue to evolve from improvements in data assimilation, numerical modeling, and observation recovery and quality control, and have become ultimately long-term climate and environmental records. Reanalyses are natural integrative tools, yet coupling the components of the Earth system in reanalyses remains a great challenge.

Observations are the key resource in producing reanalyses and improvements in algorithms and quality control are still advancing. Additional challenges remain to account for model bias as new data are assimilated and the observation record evolves (e.g., new instruments replace old). These issues are especially important for using reanalyses in climate research. Extending the reanalysis record back in time is a fundamental need of the weather and climate research community. Considering these challenges, we plan to convene the 4th WCRP International Conference on Reanalyses with the objectives of:

  1. Sharing understanding of the major challenges facing reanalyses: the changing observing system and Integrated Earth system.
  2. Assessing the state of the disciplinary atmospheric, ocean and land reanalyses, including the needs of the research community for weather, ocean, hydrology and climate reanalyses.
  3. Reviewing the new developments in the reanalyses, models and observations for study of the Earth System.
  4. Exploring international collaboration in reanalyses including its role in regional and global climate services.

Expected Outcomes:

See Conference Trifold

Program Committee

Call for Abstracts

Submission Deadline Extended to 13 February 2022

General Information:

Abstract submission will be used to select presentations for poster and oral sessions. Poster sessions will be the main form of presentation during the Conference. The number of oral presentations is limited and only a selected number of talks will be chosen. Individuals who wish to present their work are encouraged to submit an abstract of their presentation.

Submission Guidelines/Themes:

Abstracts covering work on the following themes will be accepted for oral or poster presentations. Text may be submitted in Microsoft Word (.doc) or .rtf formats. See the template for submitting abstracts. If you have any questions, please send an e-mail to

  1. Status and Plans: Major international reanalysis development, including broad disciplinary overviews (e.g., atmosphere, oceans, hydrology, cryosphere).
  2. Validation and Metrics: Intercomparison and validation studies; assessing the impact of the assimilation and analysis increments; innovative diagnostics that characterize the degree to which a reanalysis represents reality and ultimately applicability for weather and climate research.
  3. Data Assimilation: Data assimilation techniques and impact on eventual reanalysis data products, especially producing a climate quality time series.
  4. Space and In Situ Observations: Studies on the quality and stewardship of observations and their use in reanalyses and exploiting new data types and sources.
  5. Application in Support of Climate, Weather and Environmental Services: Innovative research using reanalysis to study the weather, ocean, hydrology and climate, including operational climate monitoring, study of extremes and high impact weather, climate assessment and end-to-end decision making studies.
  6. International Collaborative Efforts: Projects and plans for developing and using reanalysis to the benefit of the international community.

Abstract/Registration Submission Site:

Abstracts are submitted as a part of registration. During registration you will be asked to create a Username and Password, which will allow you to upload a revised abstract at any time and make changes to your registration. We recommend that you use your e-mail address as your Username and create a Password that you will easily remember.

New! More than one abstract may be submitted for the Conference, but only one can be submitted online. To submit an additional abstract, please send it to Melanie Russ with a copy to

If you have any problems in uploading an abstract, please contact Melanie Russ

Abstract Revisions: If you plan to upload a revised abstract you must first send an e-mail to

Note, that at the end of the registration process you can select an option to “Pay Later.” If you choose to" Pay Later" the registration fee will be based on the “date of the payment” according to the schedule.

Conference Venue

The Conference will be held at the:

Crowne Plaza Washington DC/Silver Spring
8777 Georgia Avenue
Silver Spring, Maryland 20910 USA

Situated in the heart of the art and entertainment district of Silver Spring, this deluxe Crowne Plaza hotel puts you within walking distance of fine shops and restaurants, as well as the Silver Spring Metro Station.

The location is ideal for exploring the nation’s capital, and the Red Line Metro can quickly transport you to downtown Washington, DC to see the White House, National Zoo, Smithsonian museums and monuments.

Hotel amenities include: free Wi-Fi access, Business Center, full-service restaurant, and Fitness Center.

Special Group Rate Information

We have made arrangements with the Crowne Plaza for a special rate of US $181 per night +13% tax, which includes single or double occupany for standard double queen beds or one king bed. The US government per diem rate for lodging is $224.


If you are a graduate student and are interested in options for reducing the cost of lodging, please contact Shannon Macken (

Reservation Deadline

In order to take advantage of this rate you must reserve your room no later than 13 April 2023 (new deadline). We expect the hotel to sell out so please make your reservation early to ensure that you have a convenient place to stay.

Make Your Reservation

You can make reservations by contacting the hotel directly at 1-301-589-0800 (1-877-252-8374 tollfree within the US) and identify yourself as a participant of the 4th WCRP International Conference on Reanalyses in order to receive the reduced rate. The Crowne Plaza has set up a special website (click here) for making room reservations for the Conference.

If you receive the message that “there are no rooms available” or experience any other problems in making reservations, please contact Alex Toribi ( with a copy to

To make reservations by e-mail please contact Alex Toribi ( or if you have questions regarding your reservation.

Alternate Lodging

Registration Fees

Early Bird Registration: valid until 13 February 2023 (12AM Pacific Standard Time)

Conference Attendee: US$ 150

Student: US$ 100

Spouse/Guest attending Monday night reception: US$ 40

General Registration: valid until 6 May 2023

Conference Attendee: US$ 175

Student: US$ 150

Spouse/Guest attending Monday night reception: US$ 40

Onsite Registration: only after 6 May 2023

Everybody: US$ 275/week or US$ 100/day

What does the registration fee include?

Conference and Students Attendees: The registration fee includes full participation in the conference sessions, mid morning and afternoon refreshments and Monday Night Welcome Reception.
Spouse/Guest Attendees: Payment of the spouse/guest registration fee ($40) allows guests to accompany the conference attendee to the Welcome Reception. Guest registration does not include conference participation or materials, and is not for use by co-workers.

All participants and guests and must wear official badges at conference social events.

Student Discount

To qualify for the discounted rate, a student must be currently pursuing MSc or PhD in a conference relevant degree program. In order to prove her/his status, the student must e-mail or fax a letter from his/her supervisor and proof of enrollment to (fax: 1-240-485-1818) within one month of registration. If we do not receive the verification, the fee amount will be adjusted to the general registration price and the difference will be charged.

Making Payment

Payment can be made by Visa or Mastercard. A “Pay Later” option is available at the end of the registration process. If you choose to" Pay Later" the registration fee will be based on the date of the payment according to the schedule above.

Refund Policy

All refund requests must be received in writing ( by 1 May 2023. No refunds will be issued after this date. A $50 processing fee will be assessed on all general registration refunds due to cancellation. Student refunds will be assessed a $25 fee. Guest registrations are fully refundable.

Setting your Username and Password

As part of registration you will be asked to create a Username and Password. This login will allow you to upload a revised
abstract at any time and make changes to your registration. We recommend that you use your e-mail address as your Username and create a Password that you will easily remember.


Conference participants must accept personal responsibility for insurance against travel risk and injury. While the organizers will make every effort to observe best safety practices, WCRP encourages all participants to purchase adequate medical and liability insurance. Participants save and hold harmless the WCRP from any and all claims, losses and damages, on account of events beyond their control.

Financial Assistance

Applicants for financial support should have received e-mail notice regarding the status of their applications by March 5th. If you applied and did not receive notice, please send an e-mail to

Opportunities and Support for Students, Early Career Scientists and Scientists from Developing Countries

As part of WCRP’s ongoing commitment to education and capacity development and to train the next generation of climate experts, travel grants are available to enable and support participation of students, early career scientists and scientists from developing countries to attend the conference.

Grants will be assigned based on financial need and scientific merit of proposed presentation described in the abstract, contribution to conference and all supporting documents (see below). Priority will be given to:

  1. Students: those pursuing their graduate studies (MSc, PhD)
  2. Early Career Scientists: post-graduates and researchers who received their highest degree in 2005 or later
  3. Scientists from emerging and developing economies
    Grantees must attend the entire conference in order to benefit from the financial support which includes total refund of Abstract and Registration fees.

How to Qualify for Financial Support

In order to qualify for financial support the applicant must do the following:

  1. Submit an abstract of a paper to the conference, of which he/she is the principal author; and

  2. Submit a short Curriculum Vitae (1 page maximum) that includes their contact information, their status (e.g., student, early career scientist or scientist from emerging and developing economy), and a brief statement (300 words maximum) indicating the scientific motivation and expected benefits of his/her participation in the conference. In addition, if the applicant must state if they have received support from WMO/WCRP in the past. If the applicant is a student, she/he must send a letter from her/his supervisor, supporting her/his attendance, to

We strongly encourage the applicant to secure a significant proportion of financial support from national/institutional sources. As part of the application process, the applicant will need to provide evidence of such support, if applicable.

If you have any questions, please contact Shannon Macken at

A Scientific Panel has been established to review all the applications and select the successful candidates based on the importance of their contributions to the conference. Successful applicants will be notified of the results of the selection process by early February 2023. The deadline for submitting applications for financial support is closed.


Travel and Visa Information

Reanalysis is a scientific method for developing a comprehensive record of how weather and climate are changing over time. In it, observations and a numerical model that simulates one or more aspects of the Earth system are combined objectively to generate a synthesized estimate of the state of the system. A reanalysis typically extends over several decades or longer, and covers the entire globe from the Earth’s surface to well above the stratosphere. Reanalysis products are used extensively in climate research and services, including for monitoring and comparing current climate conditions with those of the past, identifying the causes of climate variations and change, and preparing climate predictions. Information derived from reanalyses is also being used increasingly in commercial and business applications in sectors such as energy, agriculture, water resources, and insurance.

Using a collaborative Wiki framework, the goal of is to facilitate comparison between reanalysis and observational datasets. Evaluative content provided by reanalysis developers, observationalists, and users; and links to detailed data descriptions, data access methods, analysis and plotting tools, and dataset references are available. Discussions of the recovery of observations to improve reanalyses is also a focus. The wiki framework encourages scientific discussion between members of and other reanalysis users.