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تيارات المحيطات العميقة تتجه نحو السكون

تيارات المحيطات يمكن أن تتباطأ بأكثر من 40% (أ.ف.ب)
تيارات المحيطات يمكن أن تتباطأ بأكثر من 40% (أ.ف.ب)
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تيارات المحيطات العميقة تتجه نحو السكون

تيارات المحيطات يمكن أن تتباطأ بأكثر من 40% (أ.ف.ب)
تيارات المحيطات يمكن أن تتباطأ بأكثر من 40% (أ.ف.ب)

كشفت دراسة جديدة أن تيارات المحيطات العميقة حول القارة القطبية الجنوبية يمكن أن تتباطأ بأكثر من 40 في المائة على مدى العقود الثلاثة المقبلة مما يؤدي إلى آثار كبيرة على المحيطات والمناخ، حسب وكالة الأنباء الألمانية (د.ب.أ).
وأفاد البحث الأسترالي، الذي نُشر أمس (الخميس)، في «مجلة نيتشر»، بأن انهيار التيار سيؤدي إلى ركود قاع المحيطات ويؤثر على المناخ والنظم البيئية البحرية لقرون قادمة.
وأوضحت الدراسة أن المياه الباردة التي تتدفق إلى الأسفل بالقرب من القارة القطبية الجنوبية تدفع أعمق تدفق لدوران التقلبات، وهو شبكة من التيارات التي تمتد عبر محيطات العالم.
وقال الباحث الرئيسي ماثيو إنجلاند إن التقلبات تحمل الحرارة والكربون والأكسجين والمواد المغذية في جميع أنحاء العالم، مما يؤثر على المناخ ومستوى سطح البحر وإنتاجية النظم البيئية البحرية. وأضاف: «إذا كانت للمحيطات رئتان، فستكون هذه إحداهما».
ومع انهيار هذا التيار المحيطي العميق، فإن المحيطات التي تصل أعماقها إلى أربعة آلاف متر ستعاني من ثبات الحركة.
وقال إنجلاند: «من شأن هذا أن يحبس المغذيات في أعماق المحيط، مما يقلل من العناصر الغذائية المتاحة لدعم الحياة البحرية بالقرب من سطح المحيط».
ووجدت الدراسة أن ذوبان الجليد حول القارة القطبية الجنوبية جعل مياه المحيط القريبة أقل كثافة، ما أدى إلى إبطاء دوران انقلاب القطب الجنوبي. ومن المتوقع أن يستمر ذوبان الصفائح الجليدية في القارة القطبية الجنوبية وغرينلاند في التسارع مع ارتفاع درجة حرارة الكوكب.

مواضيع
الحياة البحرية

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"We are low-keying it," Trump told news site Axios by phone Sunday.

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The billionaire has since repeated that he is keeping the option of striking Tehran on the table, but prefers to stress the economic damage inflicted on the country through economic sanctions.

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İsrail'in Gazze'ye düzenlediği hava saldırısında bir Filistinli öldü; bu, Gazze'de bir haftadan uzun süredir yaşanan ilk saldırı oldu

Gazze Şeridi'nin kuzeyinde savaşın yol açtığı yıkım, (DPA)
Gazze Şeridi'nin kuzeyinde savaşın yol açtığı yıkım, (DPA)

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Şarku’l Avsat’ın AFP’den aktardığına göre Gazze'deki Sivil Savunma Sözcüsü Mahmud Basal yaptığı açıklamada, ekiplerinin, "şehit olan genç Mehend Saade'nin naaşını ve yaralanan sivilleri Gazze'deki Şifa Hastanesi'ne naklettiğini" belirtti. Söz konusu hava saldırısının, kuzeydeki Beyt Lahiya beldesinin batısındaki kavşak yakınında bulunan bir grup vatandaşı hedef aldığı kaydedildi.

İsrail ordusundan açıklama

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Öte yandan, pazartesi sabaha karşı Gazze Şeridi'nin kuzeyindeki Cibaliye beldesinde İsrail güçlerinin açtığı ateş sonucu çok sayıda Filistinli yaralanmıştı.

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