The North American Drought Monitor - The Canadian Perspective -
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1 The North American Drought Monitor - The Canadian Perspective - Trevor Hadwen National Agroclimate Information Service AAFC-PFRA, Regina Canmore, Alberta March 16-18, 2008
2 Background The NADM is a cooperative effort between drought experts in Canada, Mexico and the United States. The objective is to monitor drought across the continent on an ongoing basis. Initiated at a workshop 2002 and is part of a larger effort to improve the monitoring of climate extremes on the continent and to provide an ongoing comprehensive and integrated assessment of drought The NADM has been delivering monthly assessments of drought severity on since March 2003.
3 The Drought Monitor Concept A consolidation of indices and indicators into one comprehensive national drought map NADM is trying to capture these characteristics: the drought s magnitude (duration + intensity) spatial extent Impacts Identify impacts (A, H) Assessment of current conditions Incorporate local expert input Be as objective as possible NOT a forecast! NOT a drought declaration!
4 A Blend of Science and Art The North America Drought Monitor blends science and art. There is no one 'correct' way to measure drought. Drought indices are used to detect and measure droughts, but different indices measure drought in different ways, and no single index works under all circumstances =
5 NADM Drought Monitor Map Drought Intensity Categories D0 Abnormally Dry (30 %tile) D1 Drought Moderate (20 %tile) D2 Drought Severe (10 %tile) D3 Drought Extreme (5 %tile) D4 Drought Exceptional (2 %tile)
6 NADM Participants & Responsibilities Participants U.S.A.: NOAA, USDA, National Drought Mitigation Center Canada: Agriculture & Agri-Food Canada (PFRA), Environment Canada (Metrological Service of Canada) Mexico: National Meteorological Service (SMN) Responsibilities Each country determines drought depiction & narrative within their national boundaries NADM lead authorship rotates amongst the participants NADM lead author integrates national drought assessments from each country, prepares continental monthly map & narrative All participants peer review product
7 Canadian Contributing Organizations and Review Team AAFC-PFRA District and Regional Offices AAFC Climate Relate Risk Committee Environment Canada Natural Resources Canada Canadian Forest Service Alberta Environment Alberta Agriculture, Food and Rural Development B.C Ministry of Environment River Forecast Centre Manitoba Hydrologic Forecast Centre Ontario Ministry of Natural Resources Low Water Response Saskatchewan Agriculture, Food and Rural Revitalization Saskatchewan Watershed Authority All arrangements with contributing organizations are informal at this point
8 Changes in Canada s Monitoring and Reporting Initially Canada was only assessing the agricultural areas. We added northern regions within the prairies in the spring of Later that year we added the rest of the Canadian Provinces, outside the agricultural extent. We still do not map the territories
9 Not Experimental Anymore BUT Regions in northern extremes of Canada may not be as accurate as other regions due to limited information
10 Monthly Assessments Monthly assessments are based on a wide range of products at national, provincial and regional scales. The data consists of near real time monitoring (AAFC and others), maps from the national drought model (AAFC), and a wide variety of provincial/regional products. Assessments also use many conditions reports from other agencies including provincial crop reports, stream flow reports, low water level advisories.
11 NADM Continental Drought Indicators The NADM drought assessments are determined independently, within each country, based on different data, indices, & analyses Drought indices covering entire continent are needed Same indices, same analysis period, same methodologies This consistency needed for depiction across international boundaries
12 Near Real Time Monitoring Station Coverage Mapped NRT stations = 508 Complete List of NRT Stations = 761 Maps include: - % of normal ppt - Percentile ppt - Accumulated ppt
13 The National Drought Model Station Coverage The National Drought Model: Drought Model Stations for April 2007 = 874 Standardized Precipitation Index (SPI) From 1 month to 5 years Soil Moisture Percent of Average Difference from Normal Total Soil Moisture Has the ability to do future projections Palmer Drought Index (PDI) PDI Palmer Z Moisture Anomaly
14 Two U.S. Data Sets Climate Divisions Stations
15 Monitoring Outside the Agricultural Extent, Especially in Northern Extremes Lack of station data for northern regions. Lack of understanding of drought assessment and drought issues in northern areas, especially north of the treeline. Research is required on how to address these issues. First priority is to improve monitoring in the boreal regions. We need to develop relative indicators for northern regions. CFS currently uses Absolute indicators. Remove sensing may be able to assist in some regions.
16 Station Density Issues Currently EC is sending data to the NCDC to be used in creating the NADM indicator maps. Lack of station density in Canada has prevented us from providing and interpolated map of all of North America. The data that is represented on the dot maps is far below what we currently get from EC for our Drought model products. This issue needs to be examined.
17 Data Discrepancy The data that NAIS uses in the National Drought Model comes from the same source as the data that is used in the NADM Indicator Maps, however the two maps show very different data densities.
18 Streamflow Data is not well Incorporated Historical Percentiles We currently lack of accessible steamflow, reservoir storage and ground water data in many regions of Canada Reservoir Storage Current Storage
19 Potential Data Untapped Data Options New sources of data from: Private networks i.e. the Weather Innovations (WIN) and the Weather Bug. Provincial seasonal networks - i.e. agriculture and forestry departments New projects such as Crop Insurance Weather Derivatives
20 Remotely Sensed Data Near-Real-Time NDVI composite generation from MODIS NOAA/NESDIS Satellite Vegetation Health Index Area with extensive aspen dieback during drought Weekly NRT surface wetness and surface temperature anomaly data from passive microwave data
21 Other Alternatives Continental Modeled Data NOAA/CPC Leaky Bucket Soil Moisture Percentiles
22 Scale and Scalability The USDM is moving toward state-level trend analysis capabilities (left) and providing more county-level drought assessment information (right). Is this a model that we would like to follow? Does Canada have the ability to monitor at this scale?
23 Blended Indicators Similar to USDM Objective Blends, but with different components and possibly different weights Short-Term Blend 35% Palmer Z Index 25% 3-Month Precip. 20% 1-Month Precip. 13% CPC Soil Model 7% Palmer Drought Index Would need serially complete data, so could not be computed on station data Long-Term Blend 25% Palmer Hydro. Index 20% 24-Month Precip. 20% 12-Month Precip. 15% 6-Month Precip. 10% 60-Month Precip. 10% CPC Soil Model
24 Living Blended Paleo Drought Project The instrumental data record (PDI & PHDI) only ~100 years Paleoclimatic data can extend our drought historical perspective back several hundred to thousands of years This project blends the current instrumental Palmer Drought Index data with the long-term gridded paleo data Is intended to expand our historical perspective But it will have an operational component that can support the NADM 0.5 x 0.5 degree latitude/longitude grid, ~ 11,400 gridpoints Fine spatial resolution for continental monitoring Will be updated operationally on a monthly basis
25 Building the Living Blended Paleo Drought Data Base The gridded reconstructed PDSI data from the paleo record can be blended with the gridded PDSI computed from the instrumental data. The instrumental gridded PDSI will be updated operationally on a monthly basis. Point-by-point regression method applied to the 20 th Century period common to both data bases. This allows reconstruction of gridded PDSI for the pre-20 th Century period covered by the tree ring data.
26 Online Drought Impact Data Collection
27 Exploring IMS as an option of receiving data and reports
28 Findings from the NADM Canadian Workshop, Guelph Ontario, March 2008 Incorporate Remote Sensing data into the assessments Improve our data density Do a better job incorporating hydrologic data Explore linking NADM to policy and programs. Get more resources and better collaboration We need more resources and further development to increase frequency of products. Continue to research and develop a set of indicators that defines drought but has the flexibility to be geographically sensitive and meaningful to all sectors. Improve our understand and ability to monitor outside the agricultural region of Canada. Explore using blended of indices. We need to expand the NADM Canadian team to complete the national assessments.
29 2008 North American Drought Monitor Workshop October 2008 NADM Workshop in Canada To be organized jointly by Canadian & U.S. participants (Agriculture and Agri-Food Canada and NOAA/National Climatic Data Center)
30 Thank You Trevor Hadwen The National Agroclimate information Service, AAFC-PFRA
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32 History of the Canadian Participation in NADM Nov Troika Meeting The three countries agree in principle to establish extremes monitoring partnership April 2002 Ashville NC - USDM/NADM Workshop at NCDC The NADM concept was developed as part of the extremes monitoring initiative Canada made a commitment to provide analyses in the agricultural landscapes of Canada April 2003 First experimental NADM map released NAIS has produced a monthly assessment each month since May 2003 First Canadian NADM Workshop Held in Edmonton Purpose to develop an Canadian team to conduct the NADM operationally Oct Canada hosted the NADM Workshop in Regina Fall 2005 A special focus workshop with the Forestry community was held in Edmonton. Purpose to determine how to monitor conditions in forested regions of Canada Oct NADM Workshop in Mexico City, MX March 2008 Canadian NADM Workshop In Guelph
33 The four main goals: To better understand what monitoring and reporting is occurring across Canada regionally and how these efforts may potentially assist the NADM project To better understand the needs of each of the regions in terms of drought monitoring and reporting. To develop contacts with in the regions to assist with local conditions reporting Evaluate the current status of the NADM and to discuss potential new developments and opportunities. NADM Canadian Workshop, Guelph Ontario, March 2008 Objectives of the workshop Our aim is to bring Provincial and Federal representation from the agricultural, water management and forestry sectors and others interested in monitoring weather, climate and drought conditions across Canada, to meet and discuss how to move the operational delivery of the NADM forward in Canada.
34 Potential Opportunities, Areas of Growth and Limiting Factors Possibilities are endless, however we face some significant limited factors including: Lack of data - Most of our data is for the agricultural areas of Canada. Very little is available for artic or even the boreal areas Need for research. We need to better understand how to assess drought regionally, including in northern Canada. The resources (people and money) dedicated to this project is very low in Canada; we need to expand the team within Canada to deliver the NADM more efficiently more accurately and more timely.
35 Two Major Drought Indicator Types 1. Relative Indicators Provide a measure of moisture relative to the long-term mean and variability at a given location. e.g., - Standardized Precipitation Index, - Palmer Indices 2. Absolute Indicators Provide a measure of moisture conditions as they affect biophysical processes such as fire (fuel moisture), forest carbon & water fluxes (soil moisture) & stream flow (water runoff) e.g., - Canadian Forest Fire Weather Index System - Climate Moisture Index
36 Building the Living Blended Paleo Drought Data Base Paleoclimatic (tree ring) data base across the U.S., Canada, & Mexico Spans the period from the late 20 th Century back several hundred years
37 Living Blended Paleo Drought Monitoring Creating the Blend The gridded reconstructed PDSI data from the paleo record can be stitched to or blended with the gridded PDSI computed from the instrumental data. The instrumental gridded PDSI will be updated operationally on a monthly basis. Thus, the paleo-instrumental gridded blend is a living drought data base.
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47 Current Procedure for the Canadian Monthly Assessments 1. Production of the near real time monitoring products. 2. Data sent from Environment Canada to NCDC and NAIS. 3. Production of the monthly National Drought Model products 4. Collection of other various maps and reports from a wide range of organizations. 5. AAFC Climate Production Related Risk Committee 6. Create Canadian Draft Assessment Map merged with US and Mexican assessments. 7. Send out the draft map to the Canadian Review Team. 8. Evaluate and incorporate feedback into a final map of Canada 9. Add impact areas on to the map 10. Work out boarder issues with the US authors 11. Draft Narrative 12. Finalize map and narrative We also often provide GIS support to the US and Mexico to merge the data layers from the three countries and deal with any boarder issues.
48 Issue of Scale and Scalability
49 Issue of Scale and Scalability
50 Remote Sensing Information
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