24/7 Space News
EARTH OBSERVATION
Climate and land use shifts alter Africa's Sudano-Sahelian dryland regions
Figure 1 (a) Trends in annual mean NDVI; (b) Rainfall-driven attributions of NDVI trends. Gray areas show insignificant trends (p=0.05). The black boxes in (b) are the nine hotspot sub-regions selected to analyze the impacts of potential drivers on vegetation greenness trends, including non-rainfall-driven greening clusters (A1: Senegal; A2: central Niger; A3: Ethiopia), non-rainfall-driven browning clusters (B1: Benin-Niger-Nigeria; B2: eastern Nigeria; B3: southern Chad), rainfall-driven greening clusters (C1: western Sahel (Mali and western Burkina Faso); C2: western Chad; C3: Sudanian savannah (Sudan and South Sudan)). (Image by AIR)
ADVERTISEMENT
Climate and land use shifts alter Africa's Sudano-Sahelian dryland regions
by Simon Mansfield
Sydney, Australia (SPX) Jul 19, 2023

A comprehensive understanding of the long-term vegetation dynamics and their potential influences in the Sudano-Sahelian region of Africa is pivotal in progressing sustainable management of these delicate dryland ecosystems. These trends and changes, particularly those not attributable to rainfall, need a more in-depth examination to decode the role of non-climatic factors like land use and land cover (LULC), as well as the impact of fires.

In a recent study published in Regional Environmental Change, meticulous examination of trends in vegetation greenness was carried out using satellite data from 2001 to 2020. This was done at the pixel scale across the Sudano-Sahelian region. The focus was to quantify the relative contributions of climatic and non-climatic factors, region by region.

This investigation was undertaken by the EOWATER team at the State Key Laboratory of Remote Sensing Science, under the aegis of the Aerospace Information Research Institute (AIR), and the Chinese Academy of Sciences (CAS).

The team utilized MODIS NDVI, a reliable indicator of vegetation greenness, as a cornerstone of their analysis. They found a general pattern of greening across the Sudano-Sahelian region. However, they also discovered areas of browning or vegetation loss, which were primarily concentrated in central West Africa.

To scrutinize rainfall-driven changes, a correlation-based attribution model was used. Surprisingly, their results indicated that only nearly half of the regions exhibiting vegetation greening could be attributed to long-term variations in rainfall. Conversely, most of the browning trends did not correspond to rainfall changes. The researchers found that these greening and browning trends, unrelated to rainfall, could likely be attributed to non-climatic factors, specifically changes in LULC and the influence of fires.

The impact of LULC changes on vegetation greenness was found to be locally significant in certain sub-regions of the Sudano-Sahelian. By examining the fractional abundance of LULC classes within each NDVI pixel, the study revealed that gains, represented by increases in LULC classes, in cropland and natural vegetation due to positive land management were the primary drivers of greening in Senegal and Ethiopia.

The team also discovered that the combined influence of rainfall variability and LULC changes contributed to greening trends in Mali and Sudan.

Conversely, the study noted that browning of vegetation in central West Africa was linked to the expansion of cropland and reduction of natural vegetation, typically associated with extensive agricultural activities. These findings underline the need for more sustainable natural resource management in the region, especially in light of ongoing population growth.

The study also found that repeated fires for agricultural expansion in central West Africa were compounding the browning of vegetation.

These findings provide a more nuanced understanding of vegetation dynamics in the Sudano-Sahelian drylands. It underscores the critical role of both climatic and non-climatic factors in shaping these ecosystems, which are facing mounting pressure due to the intensifying demand for land resources. These insights will be instrumental in guiding future efforts towards sustainable management and preservation of these fragile dryland ecosystems.

Research Report:Changes in vegetation greenness related to climatic and non-climatic factors in the Sudano-Sahelian region

Related Links
Aerospace Information Research Institute
Earth Observation News - Suppiliers, Technology and Application

Subscribe Free To Our Daily Newsletters

RELATED CONTENT
The following news reports may link to other Space Media Network websites.
EARTH OBSERVATION
HawkEye 360 raises $58M for satellite architecture and data science acceleration
Herndon VA (SPX) Jul 14, 2023
HawkEye 360 has secured $58 million in a new round of funding. This financial backing, designated as the Series D-1 funding round, is set to be channeled into the development of innovative space systems and expanding analytics which are pivotal in supporting high-value defense missions. Leading the Series D-1 funding round were funds and accounts managed by BlackRock (NYSE: BLK). In addition to this, Manhattan Venture Partners and other existing investors including Insight Partners, NightDragon, S ... read more

ADVERTISEMENT
ADVERTISEMENT
EARTH OBSERVATION
On space, poll shows most Americans support NASA's role, U.S. presence

Rensselaer researchers using drop module for advanced protein studies on ISS

Virgin Galactic's next spaceflight will include sweepstakes winners

Euclid's large halo around indefinitely small point

EARTH OBSERVATION
AROBS Engineering Takes Lead Role in Space Rider Project Software Verification and Validation

Protecting Space Assets through Innovation: Hyperspace Challenge 2023

Rocket Lab delivers seven satellites to orbit with Electron Rocket

SpaceX aborts launch of Starlink satellites

EARTH OBSERVATION
Senate expresses 'significant concerns' over NASA's Mars sample-retrieval plan

The Lion's Mane: Sols 3892-3893

The clays of Mawrth Vallis

It's all still Rock and Roll to Us: Sols 3889-3891

EARTH OBSERVATION
Shenzhou XVI crew set to conduct their first EVA

Commercial space projects expected to provide more services in China

Timeline unveiled for China's advanced manned spacecraft's inaugural flight

China's Shenzhou XVI astronauts conduct fluid physics experiments

EARTH OBSERVATION
Future of Satellite Internet: OneWeb vs Starlink

SpaceX launches 54 Starlink satellites, ties record for first-stage returns

ESA moves ahead with In-Orbit Servicing missions

CASIC plans new satellite network by 2030

EARTH OBSERVATION
Simulating Aeolus's return: mission control feels the heat

Boeing's Millennium Space Systems amplifies small satellite production

Flat sapphire windows for hypersonic aircraft and weapons

Wind River VxWorks software chosen for Astroscale's Space Debris Solution ELSA-M

EARTH OBSERVATION
PSI's David Grinspoon Appointed to New NASA Post

New study reveals Roman Telescope could find 400 Earth-mass rogue planets

Life on Earth didn't arise as described in textbooks

MSU studies nutrients that may have fertilized ancient photosynthesis in Earth's oceans

EARTH OBSERVATION
SwRI team identifies giant swirling waves at the edge of Jupiter's magnetosphere

First ultraviolet data collected by ESA's JUICE mission

Unveiling Jupiter's upper atmosphere

ASU study: Jupiter's moon Europa may have had a slow evolution

Subscribe Free To Our Daily Newsletters


ADVERTISEMENT



The content herein, unless otherwise known to be public domain, are Copyright 1995-2023 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.