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Climate change and future scenarios for palisade grass production in the state of São Paulo, Brazil PAB
Andrade,André Santana; Santos,Patricia Menezes; Pezzopane,José Ricardo Macedo; Bettiol,Giovana Maranhão; Evangelista,Sílvio Roberto Medeiros.
The objective of this work was to analyze future scenarios for palisade grass yield subjected to climate change for the state of São Paulo, Brazil. An empirical crop model was used to estimate yields, according to growing degree-days adjusted by one drought attenuation factor. Climate data from 1963 to 2009 of 23 meteorological stations were used for current climate conditions. Downscaled outputs of two general circulation models were used to project future climate for the 2013-2040 and 2043-2070 periods, considering two contrasting scenarios of temperature and atmospheric CO2 concentration increase (high and low). Annual dry matter yield should be from 14 to 42% higher than the current one, depending on the evaluated scenario. Yield variation between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria brizantha; Urochloa brizantha; Empirical model; ETA; Precis; Tropical grass..
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014001000745
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Sea Surface Ka-Band Doppler Measurements: Analysis and Model Development ArchiMer
Yurovsky, Yury; Kudryavtsev, Vladimir; Grodsky, Semyon; Chapron, Bertrand.
Multi-year field measurements of sea surface Ka-band dual-co-polarized (vertical transmit–receive polarization (VV) and horizontal transmit–receive polarization (HH)) radar Doppler characteristics from an oceanographic platform in the Black Sea are presented. The Doppler centroid (DC) estimated using the first moment of 5 min averaged spectrum, corrected for measured sea surface current, ranges between 0 and ≈1 m/s for incidence angles increasing from 0 to 70∘ . Besides the known wind-to-radar azimuth dependence, the DC can also depend on wind-to-dominant wave direction. For co-aligned wind and waves, a negative crosswind DC residual is found, ≈−0.1 m/s, at ≈20 ∘ incidence angle, becoming negligible at ≈ 60 ∘ , and raising to, ≈+0.5 m/s, at 70∘ . For our...
Tipo: Text Palavras-chave: Radar; Scatterometer; Ocean; Backscatter; Doppler shift; Doppler centroid; Sea surface current; Wind drift; Modulation; Transfer function; Empirical model.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60077/63399.pdf
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Un modèle empirique du recrutement pour le stock de coquilles Saint Jacques, Pecten maximus (L.) en baie de Saint-Brieuc (Manche, France) ArchiMer
Fifas, Spyros; Dao, Jean-claude; Boucher, Jean.
This paper proposes an empirical model for the recruitment of the scallop stock, Pecten maximus (L.), in Saint-Brieuc Bay (English Channel, France). This stock shows important fluctuations in recruitment. The use of traditional models for fish population dynamics based upon an equilibrium state were inadéquate. This model includes three independent variables: spawning biomass, effects of fishing effort on the unexploited year classes, and temperature. Correlations between these expressions of independent parameters and recruitment are systematically analysed. The choice of the final model relies on minimization of the total variance unexplained portion. Introduction of fishing pattern into the model is realized by testing fishing effort effects upon two...
Tipo: Text Palavras-chave: Recrutement; Modèle empirique; Pecten maximus; Température; Biomasse féconde; Effort de pêche; Recruitment; Empirical model; Pecten maximus; Temperature; Spawning biomass; Fishing effort.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00189/30069/28557.pdf
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การพัฒนาสมการเอ็มไพริคอลเพื่อทำนายความรุนแรงในโรคไหม้ของข้าวโดยใช้ตัวแปรภูมิอากาศ Thai Agricultural
Wichit Sirisantana; Kasem Soontrajarn; Parkpian Aranyanart; Dara Chettanajit.
Tipo: Collection Palavras-chave: Empirical model; Climatic variables; Rice blast severity; Prediction; สมการเอ็มไพริคอล; ตัวแปรภูมิอากาศ; โรคไหม้; ความรุนแรงของโรค; ข้าว; การพยากรณ์โรคระบาด; รูปแบบการจำลอง; ค่าดัชนีภูมิอากาศ; การคำนวณ; อาการของโรค.
Ano: 2003 URL: http://anchan.lib.ku.ac.th/agnet/handle/123456789/3099
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