Crop monitoring in Europe

Transcription

1 r Online version Issued: 15 December 2014 Crop monitoring in Europe MARS Bulletin Vol. 22 No. 12 (2014) Weakly hardened crops in western and central Europe During the period of review, the western half of Europe was typically warmer-than-usual, while Belarus, Ukraine and Russia experienced below average daily temperatures and freezing weather conditions from late November onwards. The precipitation considerably exceeded the average in southern Europe and western Maghreb, but a broad region between Germany and the Ural Mountains remained dry. The decreasing temperatures of late autumn and early winter in eastern Europe initiated the hardening of winter cereals. During this process, the freezing point of plant cellular liquids decreases, thus increasing the tolerance of winter crops to low-temperatures, which is crucial to survive harsh winter conditions. Our model simulation results indicate that the hardening of winter wheat progressed significantly in the eastern half of Europe. However the mild and warm autumn in western and central Europe allowed winter cereals to gain strength before the winter, but hampered the hardening process. Winter wheat is not hardened at all (all western and southern regions) or just slightly hardened (e.g. Germany, Czech Republic, western Poland). The current situation is delicate, however, considering the weakly hardened crops in Europe s western and central regions. If a cold air intrusion accompanied by shallow snow cover occurs frost kill events are very likely. Yet currently no severe cold spell is forecast. 1

2 Agro-meteorological overview (1 November 09 December) During the period of review, the western half of Europe was typically warmer-than-usual, while Belarus, Ukraine and Russia experienced below average daily temperatures and freezing weather conditions from late November onwards. The precipitation considerably exceeded the average in southern Europe and western Maghreb, but a broad region between Germany and the Ural Mountains remained dry. During November and early December, Europe was split into two different climatological regions. The temperatures mostly exceeded the average in the Mediterranean region and central and western Europe, while the eastern part of Europe was colder-than-usual. The positive thermal anomaly in central and western Europe typically exceeded +2 C for the daily mean temperature, but reached C in the Central Mediterranean, Scandinavia and in the region of Carpathian Basin and the adjacent areas. The cumulated active temperatures (Tbase=0 C) indicate a huge surplus (>100 GDD) in Italy, western part of the Balkan and some smaller spots of central Europe. A positive deviation of more than 60 GDD has been recorded from eastern Spain to western Romania, including France, Germany, Benelux, Denmark and additionally Tunisia and eastern Algeria. Towards the end of November, a severe cooling started in the Baltic States, eastern half of Poland and Romania as well as in Ukraine and Russia. Temperatures remained below the average by 2-8 C in eastern Europe. The freezing weather intensified in the first dekad of December, and daily minimum temperatures of -15 C in Ukraine and C in eastern Russia were observed, which is at least 10 C lower-than-usual for this period of the year. Considering the whole period, the precipitation was abundant in the Mediterranean Basin and along the Atlantic coast, but drier-than-usual conditions were observed in large parts of eastern Europe. Rainfall was scarce or absent (<20 mm) in eastern Germany, western Poland, eastern Belarus, north-eastern part of Ukraine and big areas of southern and central Russia. Due to the precipitation deficiency, the snow-cover formation was problematic in western Russia and Ukraine. By contrast, excessive and locally devastating (e.g. floods and water logging) rainfalls (>300 mm) were experienced in southern France, Italy and along the western coastline of the Balkan and, Iberian Peninsula. In several places of the Mediterranean Basin, these abundant rainfall events were persistent, concentrated over the first two dekads of November and had a high intensity. The western shore of Ireland, Scotland, Turkey and Morocco also received high precipitation amounts. Cumulated rainfall was plentiful, but only slightly more than the average in the eastern side of the British Isles, central and western France, Spain (especially in the eastern half), southern Sweden, Finland, Romania, Bulgaria, and in Algeria. Winter frost kill The decreasing temperatures of late autumn and early winter in eastern Europe initiated the hardening of winter cereals. During this process, the freezing point of plant cellular liquids decreases, thus increasing the tolerance of winter crops to low-temperatures, which is crucial to survive harsh winter conditions. Our model simulation results indicate that the hardening of winter wheat progressed significantly in the eastern half of Europe during November. During the first dekad of December, winter wheat partially hardened in eastern Poland, eastern Romania, the Baltic States, Finland, Belarus, Ukraine and in the southern Okrug of Russia. In some spots in Ukraine and in the Central district of Russia only minor hardening has been reached. Due to the unsatisfactory hardening coupled with extreme low temperatures (Tmin < -18 C) during the cold spell and the absence of a snow cover or a very shallow one frost damages are expected in those regions. The mild and warm late autumn in western and central Europe allowed winter cereals to gain strength before the winter, but hampered the hardening process. Winter wheat is not hardened at all (all western and southern regions) or just slightly hardened (e.g, Germany, Czech Republic, western Poland). The current situation is delicate, however, considering the weakly hardened crops in Europe s western and central regions. If a cold air intrusion accompanied by shallow snow cover occurs frost kill events are very likely. 2

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4 Weather forecast for the coming days 12 December - 21 December Contrasting weather conditions are expected over Europe for the next 10 days. Unstable weather will prevail over many areas of western and northern Europe. The expected synoptic situation will bring a cold air mass over the British Isles, northern Europe, northern Germany and the Baltic countries at the beginning of the forecast period, followed by a warming tendency after 15 December. Nevertheless, no cold spell is foreseen for the major part of Europe, except European Russia. Frequent rainfalls will occur over northern Europe, northern Germany, the Baltic and the Benelux countries, whereas drier-than-usual conditions are forecast over the Balkans and eastern Europe as well as northern Mediterranean. The Azores anticyclone is extending from the Atlantic to the western Mediterranean and the Alpine region, bringing stable atmospheric conditions in the area. Northern Europe is under the influence of a deep cyclonic system, currently located over the Norwegian Sea. The extended frontal system, connected to it, will bring cold air mass over north-western Europe, especially over the British Isles, at the beginning of the forecast period. At the same time, the warm branch of the cyclone system is bringing rainy weather over northern Germany, southern Scandinavia, Poland and southern Baltic. A cut off low pressure system is expected to dominate the weather over the Iberian Peninsula until 16 December, when it is forecast to move over the northern Mediterranean and fade out. Northern Europe will be under the influence of Atlantic cyclones throughout the forecast period, with connected frontal systems hitting the British Isles, northern and central Europe. The expected synoptic situation will generally bring warmer than usual conditions over Europe, with the exception of the British Isles, western Scandinavia and the southern part of the Iberian Peninsula and some regions over northern Mediterranean, where normal or slightly lower than usual temperatures will be observed. The hardening process for winter cereals will therefore be hampered, especially over agricultural areas of western and central Europe. However, no severe cold spell is expected over Europe during the forecast period. Frequent rainfalls will occur over northern Europe, northern Germany, the Baltic and the Benelux countries. The weather is expected to remain drier than usual over the Balkans and eastern Europe as well as northern Mediterranean. 4

5 z MARS Bulletins 2014 Date Publication Reference 27 Jan Agromet. analysis Vol. 22 No Feb Agromet.analysis Vol. 22 No Mar Agromet. analysis and Vol. 22 No. 3 yield forecast 14 Apr Agromet. analysis, Vol. 22 No. 4 remote sensing and yield forecast 12 May Agromet. analysis, Vol. 22 No. 5 analysis 23 Jun Agromet. analysis, Vol. 22 No Jul Agromet. analysis, Vol. 22 No. 7 forecast, pasture and rice analysis 25 Aug Agromet. analysis, yield Vol. 22 No Sep Agromet. analysis, Vol. 22 No Oct Agromet. analysis, Vol. 22 No. 10 forecast, pasture analysis and rice analysis 24 Nov Agromet. analysis and Vol. 22 No. 11 yield forecast, sowing conditions 15 Dec Agromet. analysis Vol. 22 No Dec Campaign 2013 / 14 review Voll 22 No. 13 The current MARS* Bulletin is an EC publication from AGRI4CAST (JRC/IES MARS Unit) All MARS Bulletins are available under: Analysis and reports B. Baruth, I. Biavetti, A. Bussay, A. Ceglar, G. De Sanctis, G. Fontana, S. Garcia Condado, S. Karetsos, R. Lecerf, R. Lopez, L. Seguini, A. Toreti, M. Van den Berg, M. Van der Velde. Reporting support G. Mulhern Edition B. Baruth, M. Van den Berg, S. Niemeyer Data production MARS unit AGRI4CAST/JRC, ALTERRA (NL), Datameteo (IT), Meteogroup (NL) Contact JRC IES-MARS / AGRI4CAST Group info-agri4cast@jrc.ec.europa.eu *MARS stands for Monitoring Agricultural Resources Legal Notice: Neither the European Commission nor any person acting on behalf of the Commission is responsible for the use which might be made of this publication. Disclaimer: The geographic borders are purely a graphical representation and are only intended to be indicative. The boundaries do not necessarily reflect the official EC position. Technical note: The long-term average (LTA) used within this Bulletin as a reference is based on an archive of data covering As the Commission s in-house science service, the Joint Research Centre s mission is to provide EU policies with independent, evidence-based scientific and technical support throughout the whole policy cycle. Working in close cooperation with policy Directorates-General, the JRC addresses key societal challenges while stimulating innovation through developing new standards, methods and tools, and sharing and transferring its know-how to the Member States and international community. The mission of the JRC-IES is to provide scientific-technical support to the European Union s policies for the protection and sustainable development of the European and global environment.