وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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هو تأثير جوي جغرافي، يحدث عندما تتدفق الكتل الهوائية فوق التضاريس العالية، فعندما يرتفع الهواء فوق الجبال يبرد ويتكثف بخار الماء ما يؤدي إلى تركز المطر على الجانب المواجه للريح الساحلية من الجبال دون الطرف الآخر.
يساهم التأثير الأوروغرافي في تعرض المناطق الجبلية المرتفعة من العالم لمزيد من الأمطار بدلاً من السهول المجاورة لها، ما يساهم في تأمين المياه للنقاط المرتفعة من تلك الجبال والتي قد تصبح لاحقاً جداول مياه تغذّي الوديان المجاورة.
تؤثر الجبال على عمق العاصفة وشدتها والمناخ المحلي، حيث تسبب الجبال والتضاريس المرتفعة التبريد السريع للكتل الهوائية المتزايدة، ما يؤدي إلى زيادة هطول الأمطار مع زيادة الارتفاع، وبسبب وجود الجبال لحقبات تاريخية طويلة فهي تؤثر على المناخ بشكل عام.
يساعد التأثير الأوروغرافي في تشكيل السحاب عن طريق تبريد الهواء إلى درجة حرارة تسبب تكثف بخار الماء، ما يؤدي إلى تكوين السحب وهطول الأمطار لاحقاً.
من الممكن التفريق بين الظاهرتين بالشكل التالي:
ما أكثر المواقع تعرضاً للتأثير الأوروغرافي ما يلي:
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