Question: Who was the first European in America to see the source of the warm moist air mass over the Andes in the country Choripan comes from?

<P0-S0> Although the centre and the eastern parts of the country are mostly flat, the west is mountainous. <P0-S1> Both the Andes and Sierras Pampeanas affect the climate of Argentina, leading to differences in temperature, pressure, and spatial distribution of precipitation depending on the topography and altitude. <P0-S2> Here, the Andes exert an important influence on the climate. <P0-S3> Owing to the higher altitudes of the Andes north of 40 S, they completely block the normal westerly flow, preventing low pressure systems containing moisture from the Pacific Ocean from coming in. <P0-S4> Thus, much of Argentina north of 40 S is dominated by wind circulation patterns from the South Atlantic High. <P0-S5> South of 40 S, the Andes are lower in altitude, allowing much of Patagonia to be dominated by westerly winds and air masses from the Pacific Ocean. <P0-S6> However, the north -- south orientation of the Andes creates a barrier for humid air masses originating from the Pacific Ocean. <P0-S7> This is because they force these air masses upwards, cooling adiabactically. <P0-S8> Most of the moisture is dropped on the Chilean side, causing abundant precipitation and cloudiness while on the Argentine side, the air warms adiabatically, causing it to become drier as it descends. <P0-S9> Thus, an extensive rain -- shadow is present in much of Patagonia, causing it to receive very little precipitation. <P0-S10> The Sierras Pampeanas influences the climate on a much smaller scale than the Andes. <SEP> <P1-S0> Choripán (plural: "choripanes") is a type of sandwich with chorizo, popular in Argentina, Chile and Uruguay. <P1-S1> Similar to the American hot dog, the name comes from the combination of the names of its ingredients: a grilled chorizo sausage and a crusty bread () such as a "marraqueta", baguette or francés. <SEP> <P2-S0> tropical and equatorial air masses are hot as they develop over lower latitudes. <P2-S1> those that develop over land (continental) are drier and hotter than those that develop over oceans, and travel poleward on the western periphery of the subtropical ridge. <P2-S2> maritime tropical air masses are sometimes referred to as trade air masses. <P2-S3> monsoon air masses are moist and unstable. <P2-S4> superior air masses are dry, and rarely reach the ground. <P2-S5> they normally reside over maritime tropical air masses, forming a warmer and drier layer over the more moderate moist air mass below, forming what is known as a trade wind inversion over the maritime tropical air mass. <P2-S6> continental polar air masses (cp) are air masses that are cold and dry due to their continental source region. <P2-S7> continental polar air masses that affect north america form over interior canada. <P2-S8> continental tropical air masses (ct) are a type of tropical air produced by the subtropical ridge over large areas of land and typically originate from low - latitude deserts such as the sahara desert in northern africa, which is the major source of these air masses. <P2-S9> other less important sources producing ct air masses are the arabian peninsula, the central arid / semi-arid part of australia and deserts lying in the southwestern united states. <P2-S10> continental tropical air masses are extremely hot and dry. <SEP> <P3-S0> the area receives about 820 millimetres (32.3 in) of annual rainfall, which is concentrated from june through september/october with little or no precipitation the remainder of the year. <P3-S1> the area has two main seasons. <P3-S2> the rainy season runs from june to october when winds bring in tropical moisture from the sea. <P3-S3> the dry season runs from november to may, when the air is relatively drier. <P3-S4> this dry season subdivides into a cold period and a warm period. <P3-S5> the cold period spans from november to february when polar air masses push down from the north and keep the air fairly dry. <P3-S6> the warm period extends from march to may when tropical winds again dominate but do not yet carry enough moisture for rain. <SEP> <P4-S0> Explorers flying the flag of Spain reached the New World beginning in 1492 with the discovery of America by Christopher Columbus. <P4-S1> Spanish expeditions colonized and explored vast areas in North and South America following the grants of the Pope (contained in the 1493 papal bull Inter caetera) and rights contained in the 1494 Treaty of Tordesillas and 1529 Treaty of Zaragoza. <P4-S2> These formal acts gave Spain the exclusive rights to colonize the entire Western Hemisphere (excluding eastern Brazil), including all of the west coast of North America. <P4-S3> The first European expedition to actually reach the west coast was led by the Spaniard Vasco Núñez de Balboa, who reached the Pacific coast of Panama in 1513. <P4-S4> In an act of enduring historical importance, Balboa claimed the Pacific Ocean for the Spanish Crown, as well as all adjoining land and islands. <P4-S5> This act gave Spain exclusive sovereignty and navigation rights over the entire west coast of North America.