The dry season is a yearly period o

The dry season is a yearly period of low rainfall, especially in the tropics. The weather in the tropics is dominated by the tropical rain belt, which moves from the northern to the southern tropics and back over the course of the year. The tropical rain belt lies in the southern hemisphere roughly from October to March; during that time the northern tropics have a dry season with sparser precipitation, and days are typically sunny throughout. From April to September, the rain belt lies in the northern hemisphere, and the southern tropics have their dry season. Under the Köppen climate classification, for tropical climates, a dry season month is defined as a month when average precipitation is below 60 millimetres (2.4 in).[1]

The dry season has low humidity, and some watering holes and rivers dry up. This lack of water (and hence of food) may force many grazing animals to migrate to more fertile spots. Examples of such animals are zebras, elephants,[2] and wildebeest. Because of the lack of water in the plants, bushfires are common.[3]

Data shows that in Africa the start of the dry season coincides with a rise in the cases of measles—which researchers believe might be attributed to the higher concentration of people in the dry season, as agricultural operations are all but impossible without irrigation. During this time, some farmers move into cities, creating hubs of higher population density, and allowing disease to spread more easily.[4]

The rain belt reaches roughly as far north as the Tropic of Cancer and as far south as the Tropic of Capricorn. Near these latitudes, there is one wet season and one dry season annually. At the equator there are two wet and two dry seasons, as the rain belt passes over twice a year, once moving north and once moving south. Between the tropics and the equator, locations may experience a short wet and a long wet season. Local geography may substantially modify these climate patterns, however.

New data shows that in the South American Amazon rainforest, foliage growth and coverage varies between the dry and wet seasons—with about 25% more leaves and faster growth in the dry season. Researchers believe that the Amazon itself has an effect in bringing[clarification needed] the onset of the wet season: by growing more foliage, it evaporates more water.[5] However, this growth appears only in the undisturbed parts of the Amazon basin, where researchers believe roots can reach deeper and gather more rain water.[6] It has also been shown that ozone levels are much higher in the dry than in the wet season in the Amazon basin.[7]

Hasil (Bahasa Indonesia) 1:

Musim kemarau adalah periode tahunan curah hujan yang rendah, terutama di daerah tropis. Cuaca di daerah tropis didominasi oleh sabuk hujan tropis, yang bergerak dari Utara ke selatan daerah tropis dan kembali selama tahun. Sabuk hujan tropis terletak di belahan selatan kira-kira dari Oktober sampai Maret; selama waktu itu tropis Utara memiliki musim kemarau dengan curah hujan sparser, dan hari-hari biasanya cerah sepanjang. Dari bulan April hingga September, sabuk hujan terletak di belahan bumi utara, dan daerah tropis Selatan memiliki musim kering mereka. Di bawah klasifikasi iklim Köppen, untuk iklim tropis, sebulan musim kemarau didefinisikan sebagai bulan ketika curah hujan rata-rata di bawah 60 milimeter (2,4 in). [1]Musim kemarau memiliki kelembaban rendah, dan beberapa lubang penyiraman dan sungai kering. Kurangnya air (dan karenanya makanan) mungkin akan memaksa banyak merumput hewan untuk bermigrasi ke tempat lebih subur. Contoh hewan tersebut adalah Zebra, gajah, [2] dan rusa kutub. Karena kurangnya air dalam tanaman, kebakaran semak belukar umum. [3]Data menunjukkan bahwa di Afrika awal musim kemarau bertepatan dengan peningkatan kasus-kasus campak-peneliti yang percaya mungkin dikaitkan dengan konsentrasi yang lebih tinggi dari orang di musim kemarau, seperti operasi pertanian mungkin tanpa irigasi. Selama waktu ini, beberapa petani pindah ke kota, menciptakan hub lebih tinggi kepadatan penduduk, dan memungkinkan penyakit menyebar lebih mudah. [4]Sabuk hujan mencapai kira-kira Utara Tropic of Cancer dan sejauh Selatan sebagai Tropic of Capricorn. Dekat garis lintang ini, ada satu musim hujan dan musim kemarau satu setiap tahun. Di khatulistiwa ada dua basah dan dua musim kering, sebagai sabuk hujan melewati dua kali setahun, sekali bergerak Utara dan Selatan sekali bergerak. Antara daerah tropis dan khatulistiwa, lokasi mungkin mengalami pendek basah dan musim basah panjang. Geografi lokal dapat secara substansial mengubah pola iklim, namun.Data baru menunjukkan bahwa di hutan hujan Amerika Selatan Amazon, pertumbuhan dedaunan dan cakupan bervariasi antara musim kering dan basah — dengan sekitar 25% lebih daun dan pertumbuhan lebih cepat di musim kemarau. Para peneliti percaya bahwa Amazon itu sendiri memiliki efek membawa [butuh klarifikasi] awal musim hujan: oleh tumbuh lebih dedaunan, itu menguap lebih banyak air. [5] Namun, pertumbuhan ini muncul hanya dalam bagian terganggu dari cekungan Amazon, dimana para peneliti percaya akar dapat mencapai lebih dalam dan mengumpulkan lebih banyak air hujan. [6] juga telah ditunjukkan bahwa tingkat ozon jauh lebih tinggi dalam kering daripada musim basah di cekungan Amazon. [7]