********************************************* PALEOCLIMATE MODELING INTERCOMPARISON PROJECT ********************************************* Newsletter N. 4 --------------- 11 July 1994 Dear participant, In this newsletter, we would like to inform you about organisational aspects of PMIP : -A- Structure -B- Storage policy -C- Subprojects -D- Workhops -E- Questionnaire ************* -A- Structure ************* Since its birth in May 1991 in Saclay, PMIP has essentially progressed through a loose, interactive, consensus-based decision making process. Progress has clearly been possible because of the enthusiastic participation of many of the scientists who participated in the initial planning of PMIP. We hope to continue this informal interactive way of working together, but it seems necessary that we also agree on a more official structure for the project as more people get involved and as we begin dealing formally with other projects and international programs. PMIP is now endorsed by both PAGES/IGBP (PAst Global ChangES/International Geosphere Biosphere Program) and WGNE/WCRP (Working Group on Numerical Experimentation/World Climate Research Program), highlighting the two complementary aspects of PMIP which deals both with the investigation of the mechanisms of paleoclimate changes and the evaluation of climate models through paleoclimate studies. Coordination is the responsibility of: Sylvie Joussaume (LMCE, Saclay, France) and Karl Taylor (PCMDI, Livermore, USA) Guidance will be provided by an Advisory Committee, which includes scientists involved in climate modeling and in paleodata analyses (ocean, lake levels and pollen/biomes). Larry Gates (PCMDI, Livermore, USA) John Kutzbach (CCR, Madison, USA) Suki Manabe (GFDL, Princeton, USA) John Mitchell (UKMO, Bracknell, UK) David Rind (GISS, New York,USA) to be confirmed Colin Prentice (Lund University, Sweden) Alayne Street-Perrott (University of Oxford, UK) Warren Prell (Brown University, Providence, USA) To strengthen the data-model intercomparison component of PMIP and to provide an interface for facilitating interaction between the PMIP modelers and the data community, we will adopt a recommendation from the NATO ARW in Aussois (October 1993) on "Strategies for the use of paleoclimate data sets in climate model intercomparison and evaluation" to form a Data-Model Intercomparison Subcommittee. The membership of this committee will be nominated by the organisers of this NATO ARW: Joel Guiot (LBHP, Marseille, France) Sandy Harrison (Lund University, Sweden) Pat Bartlein (University of Oregon, USA) ****************** -B- Storage Policy ****************** Concerning our strategy for storing and accessing PMIP-related data : *1* Boundary conditions and global datasets --------------------------------------- We rely on NGDC (National Geophysical Data Center) to store observationally-derived paleoclimate data, including insolation, SSTs, ice sheet reconstructions, topography, surface temperature, and biome distribution, which can be used either as boundary conditions for GCMs or to compare with the model-simulated fields. Other information (such as the PMIP Newsletters) will also be available from NGDC. All the information stored there will be freely available through anonymous ftp: ftp ngdc1.ngdc.noaa.gov name: anonymous password: your email address *2* Model output ------------ We plan to archive model outputs initially at PCMDI (Program for Climate Model Diagnosis and Intercomparison), which is where the data from our sister project (AMIP) is also stored. Model output will be available through ftp (to be described later). Please contact Karl Taylor if you are ready to provide output right now (NEW! Please check the PMIP 'Contacts' web page). *3* Access rights and publication policy for model outputs ------------------------------------------------------ Participants are expected to contribute the agreed upon monthly average fields (standard output) as soon as possible after the completion of their simulations. Any group contributing PMIP data, will have free access to the standard output of other groups, but publication of model results would require permission from the individual groups. After some period of time during which results would be published by the individual modeling groups and through subproject collaborations (discussed below), we may choose with permission from the individual groups to allow the model output to be made freely available to anyone. ************** -C Subprojects ************** Although individual modeling groups are carrying out the PMIP simulations for specific purposes, there are some common interests which could lend themselves to the formation of subprojects that would focus on particular aspects of the simulations. *1* Model-model comparisons ----------------------- The general goal of PMIP is to facilitate intercomparison of model results in these common areas of interest. Consequently, we intend to encourage the formation of PMIP subprojects, which would for example analyze the African and Asian Monsoons or the planetary wave structure in response to the 21 kyr BP boundary conditions. We expect that subprojects like these will come about naturally at the initiative of individual modeling groups, and will be more explicitly defined at the first PMIP workshop planned for mid-1995. *2* Model-data comparisons ---------------------- We expect that scientists more directly involved in creating observationally-based paleoclimate data sets will be invited to participate in many of the subprojects that are initiated by modelers. But we also will encourage the paleoclimatologists who do not run GCMs to propose and initiate subprojects. The mechanism for doing this will be either to contact a modeling group directly and develop ideas for a subproject that can be proposed at the first PMIP workshop, or to propose a project directly to the Data-Model Intercomparison Subcommittee. More information will be given in a future newsletter. *3* Permission-publication policy ----------------------------- In general, subprojects would be required to obtain permission from the individual modeling groups before using their model output. Normally,if a modeling group granted permission for the use of its output, but did nothing else in the way of analysis or preparation of special datasets, then co-authorship of the subsequent subproject publication would not necessarily be expected. Co-authorship would normally imply that an individual had at least helped in the analysis of the model output or gone significantly beyond the standard output in providing data to the subproject. ************* -D- Workshops ************* To really initiate collaborative work between PMIP participants, we plan the following workshops: - mid-1995 : a workshop focusing on model-model comparisons to take a first look at model results. Participants will be required to come with some specific charts of standard model outputs. Initial subprojects concerning model intercomparisons will be defined during this workshop. - late 1995-early 1996 : a second workshop focusing on model-data comparisons with the participation of the data community interested in PMIP. - late 1996 or 1997 : final PMIP workshop ***************** -E- Questionnaire ***************** We have a preliminary list of modelers interested in participating in PMIP which we would like to update. This will help us to prepare the first PMIP workshop. Can you please answer the following questions : ---------------- Participation to PMIP Questionnaire --------------- What is your group called? Do you indeed plan to run your model for PMIP ? Which member(s) of your group will actively participate?: Which PMIP experiments will you perform : 6 ka BP 21 ka BP with calculated SSTs 21 ka BP with prescribed SSTs When do you expect to complete your simulations ? Which model will you use and at what resolution? Any other comments, especially on the content of the present newsletter? Date Contact name and address : To be sent to paleo (NEW! Please check the PMIP 'Contacts' web page) ------------------------- END ----------------------------------------- Yours sincerely, Sylvie Joussaume (LMCE) Karl Taylor (PCMDI) and the Advisory Committee ---------------------------------------------------------------------------- Contact Address: ################ Laboratoire de Modelisation du Climat et de l´Environnement D.S.M. / Orme des Merisiers / Bat. 709 C.E. Saclay 9119 Gif-sur-Yvette cedex FRANCE Tel.: (33) 1 69.08.77.11 Fax.: (33) 1 69.08.77.16 email: paleo (NEW! Please check the PMIP 'Contacts' web page) ----------------------------------------------------------------------------